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Explore the networking protocols and technologies used by the device to connect to Wi-Fi networks, Bluetooth devices, and cellular data services.

Networking Documentation

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I have an application that uses Network Extension, and it occasionally triggers a kernel panic, resulting in a complete system freeze.
{"bug_type":"210","timestamp":"2025-07-04 14:19:35.00 +0800","os_version":"macOS 15.5 (24F74)","roots_installed":0,"incident_id":"5457889A-1002-4389-BAE6-A447733EFD78"} { "build" : "macOS 15.5 (24F74)", "product" : "MacBookPro18,4", "socId" : "6001", "socRevision" : "11", "incident" : "5457889A-1002-4389-BAE6-A447733EFD78", "crashReporterKey" : "4ABE0CA2-C60B-8B0E-557A-C0BDEB1E9144", "kernel" : "Darwin Kernel Version 24.5.0: Tue Apr 22 19:54:49 PDT 2025; root:xnu-11417.121.62/RELEASE_ARM64_T6000", "date" : "2025-07-04 14:19:35.95 +0800", "panicString" : "panic(cpu 1 caller 0xfffffe00215f28e8): Kernel data abort. at pc 0xfffffe0021310d9c, lr 0x37a67e002116f050 (saved state: 0xfffffe60706d3240)\n\t x0: 0xfffffe2eaac676f8 x1: 0x0000000000000000 x2: 0xfffffe002116f050 x3: 0x0000000000000002\n\t x4: 0x0000000000002021 x5: 0xffffffffffffffff x6: 0x0000000000000000 x7: 0x0000006ddf79e068\n\t x8: 0xf9555cb919b50093 x9: 0x0000000000000000 x10: 0x0000000000000054 x11: 0x0000000000000000\n\t x12: 0xfffffe002477dfc8 x13: 0x0000000000000001 x14: 0x0000000000000052 x15: 0x0000000000000000\n\t x16: 0x0000020061052ad4 x17: 0x0000000000000001 x18: 0x0000000000000000 x19: 0xfffffe2eaa38d000\n\t x20: 0x0000000000000000 x21: 0xfffffe2eaac676f8 x22: 0x0000000000000020 x23: 0xfffffe2eab90f000\n\t x24: 0x000000001e22b50a x25: 0x0000000000000000 x26: 0x0000000000000000 x27: 0xfffffe2eab90efb4\n\t x28: 0x0000000000003500 fp: 0xfffffe60706d35b0 lr: 0x37a67e002116f050 sp: 0xfffffe60706d3590\n\t pc: 0xfffffe0021310d9c cpsr: 0x60401208 esr: 0xfffffe6096000006 far: 0x0000000000000068\n\nDebugger message: panic\nMemory ID: 0x6\nOS release type: User\nOS version: 24F74\nKernel version: Darwin Kernel Version 24.5.0: Tue Apr 22 19:54:49 PDT 2025; root:xnu-11417.121.62/RELEASE_ARM64_T6000\nFileset Kernelcache UUID: AF6531DB60D1EB2338126CF77682B8DE\nKernel UUID: CBC2F718-53E4-3C8D-BEC7-FB6DDC3318E1\nBoot session UUID: 5457889A-1002-4389-BAE6-A447733EFD78\niBoot version: iBoot-11881.121.1\niBoot Stage 2 version: iBoot-11881.121.1\nsecure boot?: YES\nroots installed: 0\nPaniclog version: 14\nKernelCache slide: 0x0000000018540000\nKernelCache base: 0xfffffe001f544000\nKernel slide: 0x0000000018548000\nKernel text base: 0xfffffe001f54c000\nKernel text exec slide: 0x0000000019ce0000\nKernel text exec base: 0xfffffe0020ce4000\nmach_absolute_time: 0x6ddf85c206\nEpoch Time: sec usec\n Boot : 0x686680ed 0x000c5ab2\n Sleep : 0x68676ff9 0x0005fdc0\n Wake : 0x68677007 0x000d2cfa\n Calendar: 0x68677252 0x00021537\n\nZone info:\n Zone map: 0xfffffe1016000000 - 0xfffffe3616000000\n . VM : 0xfffffe1016000000 - 0xfffffe15e2000000\n . RO : 0xfffffe15e2000000 - 0xfffffe187c000000\n . GEN0 : 0xfffffe187c000000 - 0xfffffe1e48000000\n . GEN1 : 0xfffffe1e48000000 - 0xfffffe2414000000\n . GEN2 : 0xfffffe2414000000 - 0xfffffe29e0000000\n . GEN3 : 0xfffffe29e0000000 - 0xfffffe2fac000000\n . DATA : 0xfffffe2fac000000 - 0xfffffe3616000000\n Metadata: 0xfffffe5e3a010000 - 0xfffffe5e43810000\n Bitmaps : 0xfffffe5e43810000 - 0xfffffe5e4f500000\n Extra : 0 - 0\n\nTPIDRx_ELy = {1: 0xfffffe28ded6aff0 0: 0x0000000000000001 0ro: 0x000000016fd330e0 }\nCORE 0 PVH locks held: None\nCORE 1 PVH locks held: None\nCORE 2 PVH locks held: None\nCORE 3 PVH locks held: None\nCORE 4 PVH locks held: None\nCORE 5 PVH locks held: None\nCORE 6 PVH locks held: None\nCORE 7 PVH locks held: None\nCORE 8 PVH locks held: None\nCORE 9 PVH locks held: None\nCORE 0: PC=0xfffffe0020f2d330, LR=0xfffffe0020f2d368, FP=0xfffffe60717cb460\nCORE 1 is the one that panicked. Check the full backtrace for details.\nCORE 2: PC=0xfffffe0020d81094, LR=0xfffffe0020d81094, FP=0xfffffe607167bed0\nCORE 3: PC=0xfffffe0020d81094, LR=0xfffffe0020d81094, FP=0xfffffe60725d3ed0\nCORE 4: PC=0xfffffe0020d81094, LR=0xfffffe0020d81094, FP=0xfffffe6072bafed0\nCORE 5: PC=0xfffffe0020d81094, LR=0xfffffe0020d81094, FP=0xfffffe6072197ed0\nCORE 6: PC=0xfffffe0020d81094, LR=0xfffffe0020d81094, FP=0xfffffe60727abed0\nCORE 7: PC=0xfffffe0020d81094, LR=0xfffffe0020d81094, FP=0xfffffe6071897ed0\nCORE 8: PC=0xfffffe0020d81094, LR=0xfffffe0020d81094, FP=0xfffffe607149bed0\nCORE 9: PC=0xfffffe0020d81094, LR=0xfffffe0020d81094, FP=0xfffffe607214bed0\nCompressor Info: 0% of compressed pages limit (OK) and 0% of segments limit (OK) with 0 swapfiles and OK swap space\nPanicked task 0xfffffe1d4729c7a0: 1925 pages, 14 threads: pid 36674: com.TE.TEDataCloak.ne\nPanicked thread: 0xfffffe28ded6aff0, backtrace: 0xfffffe60706d28f0, tid: 743602\n\t\t lr: 0xfffffe0020d432b4 fp: 0xfffffe60706d2980\n\t\t lr: 0xfffffe0020ea52f8 fp: 0xfffffe60706d29f0\n\t\t lr: 0xfffffe0020ea3554 fp: 0xfffffe60706d2ab0\n\t\t lr: 0xfffffe0020cebb98 fp: 0xfffffe60706d2ac0\n\t\t lr: 0xfffffe0020d42b98 fp: 0xfffffe60706d2e90\n\t\t lr: 0xfffffe00215e7388 fp: 0xfffffe60706d2eb0\n\t\t lr: 0xfffffe00215f28e8 fp: 0xfffffe60706d30c0\n\t\t lr: 0xfffffe0020ea5154 fp: 0xfffffe60706d3160\n\t\t lr: 0xfffffe0020ea36c8 fp: 0xfffffe60706d3220\n\t\t lr: 0xfffffe0020cebb98 fp: 0xfffffe60706d3230\n\t\t lr: 0xfffffe002116f050 fp: 0xfffffe60706d35b0\n\t\t lr: 0xfffffe002116f050 fp: 0xfffffe60706d3730\n\t\t lr: 0xfffffe002116de88 fp: 0xfffffe60706d3780\n\t\t lr: 0xfffffe0021180174 fp: 0xfffffe60706d3810\n\t\t lr: 0xfffffe002117ea94 fp: 0xfffffe60706d38d0\n\t\t lr: 0xfffffe002117d69c fp: 0xfffffe60706d3a30\n\t\t lr: 0xfffffe0021281400 fp: 0xfffffe60706d3a80\n\t\t lr: 0xfffffe00213146dc fp: 0xfffffe60706d3c10\n\t\t lr: 0xfffffe0021324ff8 fp: 0xfffffe60706d3d00\n\t\t lr: 0xfffffe0021325580 fp: 0xfffffe60706d3de0\n\t\t lr: 0xfffffe00213edc24 fp: 0xfffffe60706d3e50\n\t\t lr: 0xfffffe0020ea35dc fp: 0xfffffe60706d3f10\n\t\t lr: 0xfffffe0020cebb98 fp: 0xfffffe60706d3f20\n\t\t lr: 0xfffffe0020cebb60 fp: 0x0000000000000000\n\nlast started kext at 3810289154: com.apple.filesystems.smbfs\t6.0 (addr 0xfffffe00200f68e0, size 111737)\nloaded kexts:\ncom.paragon-
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399
Jul ’25
Bonjour for discovering a specific device's ip
Hi, I'm new to swift programming and right now writing an app for esp8266-controlled lamp device. My lamp is broadcasting it's own IP through bonjour. So all I want is to discover any lamps in my network (http.tcp) and to read name and value. Is there any example of such implementation? All I found so far is old or a lit bit complicated for such simple question. Thanks in advance!
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16k
Dec ’25
Questions on Device Pairing with DeviceDiscoveryUI in Wi-Fi Aware
At WWDC 25, Dr. Swetank mentioned, “DeviceDiscoveryUI is for making connections between apps and from an app to another device. It supports pairing with both Apple and third-party devices.” I find the pairing process in DeviceDiscoveryUI via Wi-Fi Aware intriguing. I have two questions: Can we pair devices via Bluetooth first and then establish a Wi-Fi Aware connection? If I use DeviceDiscoveryUI, how should I write an Android program to correspond with it and achieve iPhone-Android pairing? The app is an official Apple app: https://developer.apple.com/documentation/wifiaware/building-peer-to-peer-apps.
1
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291
Jul ’25
Crash in URLConnectionLoader::loadWithWhatToDo
There are multiple report of crashes on URLConnectionLoader::loadWithWhatToDo. The crashed thread in the stack traces pointing to calls inside CFNetwork which seems to be internal library in iOS. The crash has happened quite a while already (but we cannot detect when the crash started to occur) and impacted multiple iOS versions recorded from iOS 15.4 to 18.4.1 that was recorded in Xcode crash report organizer so far. Unfortunately, we have no idea on how to reproduce it yet but the crash keeps on increasing and affect more on iOS 18 users (which makes sense because many people updated their iOS to the newer version) and we haven’t found any clue on what actually happened and how to fix it on the crash reports. What we understand is it seems to come from a network request that happened to trigger the crash but we need more information on what (condition) actually cause it and how to solve it. Hereby, I attach sample crash report for both iOS 15 and 18. I also have submitted a report (that include more crash reports) with number: FB17775979. Will appreciate any insight regarding this issue and any resolution that we can do to avoid it. iOS 15.crash iOS 18.crash
10
1
801
Jan ’26
Network Extension – Delayed Startup Time
I've implemented a custom VPN system extension for macOS, utilizing Packet Tunnel Provider. One of the users reported a problem: he was connected to the VPN, and then his Mac entered sleep mode. Upon waking, the VPN is supposed to connect automatically (because of the on-demand rules). The VPN's status changed to 'connecting', but it remained stuck in this status. From my extension logs, I can see that the 'startTunnelWithOption()' function was called 2 minutes after the user clicked the 'connect' button. From the system logs, I noticed some 'suspicious' logs, but I can't be sure if they are related to the problem. Some of them are: kernel: (Sandbox) Sandbox: nesessionmanager(562) deny(1) system-fsctl (_IO "h" 47) entitlement com.apple.developer.endpoint-security.client not present or not true (I don't need this entitlement at the extension) nesessionmanager: [com.apple.networkextension:] NESMVPNSession[Primary Tunnel:XXXXXX(null)]: Skip a start command from YYYYY:session in state connecting NetworkExtension.com.***: RunningBoard doesn't recognize submitted process - treating as a anonymous process sysextd: activateDecision found existing entry of same version: state activated_enabled, ID FAE... Are any of the logs related to the above problem? How can I debug such issues? What info should I get from the user?
5
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317
Oct ’25
Extra-ordinary Networking
Most apps perform ordinary network operations, like fetching an HTTP resource with URLSession and opening a TCP connection to a mail server with Network framework. These operations are not without their challenges, but they’re the well-trodden path. If your app performs ordinary networking, see TN3151 Choosing the right networking API for recommendations as to where to start. Some apps have extra-ordinary networking requirements. For example, apps that: Help the user configure a Wi-Fi accessory Require a connection to run over a specific interface Listen for incoming connections Building such an app is tricky because: Networking is hard in general. Apple devices support very dynamic networking, and your app has to work well in whatever environment it’s running in. Documentation for the APIs you need is tucked away in man pages and doc comments. In many cases you have to assemble these APIs in creative ways. If you’re developing an app with extra-ordinary networking requirements, this post is for you. Note If you have questions or comments about any of the topics discussed here, put them in a new thread here on DevForums. Make sure I see it by putting it in the App & System Services > Networking area. And feel free to add tags appropriate to the specific technology you’re using, like Foundation, CFNetwork, Network, or Network Extension. Links, Links, and More Links Each topic is covered in a separate post: The iOS Wi-Fi Lifecycle describes how iOS joins and leaves Wi-Fi networks. Understanding this is especially important if you’re building an app that works with a Wi-Fi accessory. Network Interface Concepts explains how Apple platforms manage network interfaces. If you’ve got this far, you definitely want to read this. Network Interface Techniques offers a high-level overview of some of the more common techniques you need when working with network interfaces. Network Interface APIs describes APIs and core techniques for working with network interfaces. It’s referenced by many other posts. Running an HTTP Request over WWAN explains why most apps should not force an HTTP request to run over WWAN, what they should do instead, and what to do if you really need that behaviour. If you’re building an iOS app with an embedded network server, see Showing Connection Information in an iOS Server for details on how to get the information to show to your user so they can connect to your server. Many folks run into trouble when they try to find the device’s IP address, or other seemingly simple things, like the name of the Wi-Fi interface. Don’t Try to Get the Device’s IP Address explains why these problems are hard, and offers alternative approaches that function correctly in all network environments. Similarly, folks also run into trouble when trying to get the host name. On Host Names explains why that’s more complex than you might think. If you’re working with broadcasts or multicasts, see Broadcasts and Multicasts, Hints and Tips. If you’re building an app that works with a Wi-Fi accessory, see Working with a Wi-Fi Accessory. If you’re trying to gather network interface statistics, see Network Interface Statistics. There are also some posts that are not part of this series but likely to be of interest if you’re working in this space: TN3179 Understanding local network privacy discusses the local network privacy feature. Calling BSD Sockets from Swift does what it says on the tin, that is, explains how to call BSD Sockets from Swift. When doing weird things with the network, you often find yourself having to use BSD Sockets, and that API is not easy to call from Swift. The code therein is primarily for the benefit of test projects, oh, and DevForums posts like these. TN3111 iOS Wi-Fi API overview is a critical resource if you’re doing Wi-Fi specific stuff on iOS. TLS For Accessory Developers tackles the tricky topic of how to communicate securely with a network-based accessory. A Peek Behind the NECP Curtain discusses NECP, a subsystem that control which programs have access to which network interfaces. Networking Resources has links to many other useful resources. Share and Enjoy — Quinn “The Eskimo!” @ Developer Technical Support @ Apple let myEmail = "eskimo" + "1" + "@" + "apple.com" Revision History 2025-07-31 Added a link to A Peek Behind the NECP Curtain. 2025-03-28 Added a link to On Host Names. 2025-01-16 Added a link to Broadcasts and Multicasts, Hints and Tips. Updated the local network privacy link to point to TN3179. Made other minor editorial changes. 2024-04-30 Added a link to Network Interface Statistics. 2023-09-14 Added a link to TLS For Accessory Developers. 2023-07-23 First posted.
0
0
5.8k
Jul ’25
Performance Concerns and Dynamic Control of Parallel Image Uploads Using Swift TaskGroup
I'm currently developing an iOS app with image upload functionality. To enhance upload speed, I'm considering implementing parallel uploads using Swift’s TaskGroup. However, I have concerns that in environments with limited bandwidth, parallelization might introduce overhead and contention, ultimately slowing down uploads instead of improving them. Specifically, I'm curious about: Is this concern valid? Does parallelizing uploads become counterproductive in low-bandwidth conditions due to overhead and network contention? If so, I'm considering dynamically adjusting the concurrency level based on network conditions. Does anyone have experience or best practices regarding such an approach? Any insights or advice would be greatly appreciated. Thank you!
1
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176
Jun ’25
Using NEVPNManager to detect VPN status and consistently returning NEVPNStatusInvalid
Hello! My app wants to disable VPN connection. I used the loadFromPreferencesWithCompletionHandler method of NEVPNManager for detection, but regardless of whether the VPN was actually connected or not, it kept returning NEVPNStatusInvalid. How should I handle this issue? NEVPNManager *vpnManager = [NEVPNManager sharedManager]; [vpnManager loadFromPreferencesWithCompletionHandler:^(NSError * _Nullable error) { if (error) { return; } NEVPNStatus status = vpnManager.connection.status; switch (status) { case NEVPNStatusInvalid: // kept returning NEVPNStatusInvalid break; case NEVPNStatusDisconnected: break; case NEVPNStatusConnecting: break; case NEVPNStatusConnected: break; case NEVPNStatusReasserting: break; case NEVPNStatusDisconnecting: break; default: break; } }];
3
0
172
Jun ’25
NWBrowser scan for arbitrary Bonjour Services with Multicast Entitlement ?!
Dear Girls, Guys and Engineers. I'm currently building a Home Network Scanner App for People which want to know which Bonjour Devices are in her/his Home Network environment. From an older Question I got the answer, that I need an Entitlement to do this. I started to work on the App and requested the Multicast Entitlement from Apple. They gave me the Entitlement for my App and now I'm trying to discover all devices in my Home Network but I got stuck and need Help. I only test direct on device, like the recommendation. I also verified that my app is build with the multicast entitlement there where no problems. My problem is now, that is still not possible to discover all Bonjour services in my Home Network with the Help of the NWBrowser. Can you please help me to make it work ? I tried to scan for the generic service type: let browser = NWBrowser(for: .bonjour(type: "_services._dns-sd._udp.", domain: nil), using: .init()) but this is still not working even tough I have the entitlement and the app was verified that the entitlement is correctly enabled if I scan for this service type, I got the following error: [browser] nw_browser_fail_on_dns_error_locked [B1] Invalid meta query type specified. nw_browser_start_dns_browser_locked failed: BadParam(-65540) So what's the correct way now to find all devices in the home network ? Thank you and best regards Vinz
10
0
2.4k
Jun ’25
Disable Local Network Access permission check
I'm using a Mac Studio in a homelab context and use Homebrew to manage the installed services. The services include things that access the local network, for example Prometheus which monitors some other servers, a reverse proxy which fronts other web services on the network, and a DNS server which can use another as upstream. Local Network Access permissions make it impossible to reliably perform unattended updates of services because an updated binary requires a GUI login to grant local network permissions (again). I use brew services to manage the services as launchd agents, i.e. they run in a non-root GUI context. I know that I can also use sudo brew services which instead installs the services as launchd daemons, but running services as root has negative security implication and generally doesn't look like a good idea to me. If only there was a way to disable local network access checks altogether…
11
0
433
Feb ’26
NWBrowser with bonjour returning PolicyDenied(-65570)
Hi, Having an issue on one mac using Xcode 16.3 and simulator 18.4. macSO 15.4 We are checking for bonjour: authorizationBrowser = NWBrowser(for: .bonjour(type: "_bonjour._tcp", domain: nil), using: parameters) authorizationBrowser?.stateUpdateHandler = { [weak self] newState in switch newState { ... } } However at the command line we get the error: nw_browser_fail_on_dns_error_locked [B1] nw_browser_dns_service_browse_callback failed: PolicyDenied(-65570) Any idea why this is happening? or what this error means? Thanks Antz
21
11
5.8k
Jun ’25
Crash in URLSessionConfiguration init in Xcode 26.0 beta (17A5241e)
It's not yet fully clear why and when does this crash occur, but I'm creating this post so there's a centralized thread for this. Some hints collected so far: The crash is occurring for existing Xcode projects opened with new Xcode 26.0 beta (17A5241e); no one's been able to reproduce on a project created in Xcode 26. I even tried creating a project with Xcode 16.2 and open it in Xcode 26, but it's all working fine there (don't have older Xcode at the moment, to try with many versions) It crashes right at the line of code that initializes URLSessionConfiguration. If you call URLSession() without parameters (which is deprecated as of iOS 13), the session initializes without the crash. It's NOT occurring only for libraries installed through package manages. In a project where it crashes, one should be able to reproduce by adding URLSessionConfiguration.default as the first line in didFinishLaunchingWithOptions It crashes when running an app on an iOS 26 simulator. (I don't have a device running beta iOS 26 to test on it!) It's working fine when running the app on a simulator or a device running iOS 18 or older. Related issue on Firebase GitHub repo: https://github.com/firebase/firebase-ios-sdk/issues/14948 Sorry to not be able to provide more info at the moment. I wanted to report this so in case someone from Apple knows about it, we could at least get some feedback or workarounds, until fix is released -- and, to prevent us all from duplicating this report in repositories of each library, as this isn't related to libraries.
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7.7k
Aug ’25
XPC Connection with Network Extension fails after upgrade
Hi Team, I have a Network Extension application and UI frontend for it. The UI frontend talks to the Network Extension using XPC, as provided by NEMachServiceName. On M2 machine, The application and XPC connection works fine on clean installation. But, when the application is upgraded, the XPC connection keeps failing. Upgrade steps: PreInstall script kills the running processes, both UI and Network Extension Let installation continue PostInstall script to launch the application after installation complete. Following code is successful to the point of resume from UI application NSXPCInterface *exportedInterface = [NSXPCInterface interfaceWithProtocol:@protocol(IPCUIObject)]; newConnection.exportedInterface = exportedInterface; newConnection.exportedObject = delegate; NSXPCInterface *remoteObjectInterface = [NSXPCInterface interfaceWithProtocol:@protocol(IPCExtObject)]; newConnection.remoteObjectInterface = remoteObjectInterface; self.currentConnection = newConnection; [newConnection resume]; But it fails to get the object id<IPCExtObject> providerProxy = [self.currentConnection remoteObjectProxyWithErrorHandler:^(NSError *registerError) { }]; Please note, this only fails for M2. For M1, this exact code is running fine. Additionally, if I uninstall the application by dropping it in Trash and then installing the newer version, then too, the application works fine.
4
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1k
Dec ’25
CallKit and PushToTalk related changes in iOS 26
Starting in iOS 26, two notable changes have been made to CallKit, LiveCommunicationKit, and the PushToTalk framework: As a diagnostic aid, we're introducing new dialogs to warn apps of voip push related issue, for example when they fail to report a call or when when voip push delivery stops. The specific details of that behavior are still being determined and are likely to change over time, however, the critical point here is that these alerts are only intended to help developers debug and improve their app. Because of that, they're specifically tied to development and TestFlight signed builds, so the alert dialogs will not appear for customers running app store builds. The existing termination/crashes will still occur, but the new warning alerts will not appear. As PushToTalk developers have previously been warned, the last unrestricted PushKit entitlement ("com.apple.developer.pushkit.unrestricted-voip.ptt") has been disabled in the iOS 26 SDK. ALL apps that link against the iOS 26 SDK which receive a voip push through PushKit and which fail to report a call to CallKit will be now be terminated by the system, as the API contract has long specified. __ Kevin Elliott DTS Engineer, CoreOS/Hardware
0
0
1.1k
Jun ’25
CarPlay vs. AccessoryKit & NEHotspotHelper
CarPlay woes. I think it's unacceptable that it silently kills an ongoing WiFi connection that has been established using ASAccessoryKit and NEHotspotHelper which is in active use. This is responsible for angry clients because their processes break a lot when they are in reach of the connected car. (And yes, they have to be in the reach of the car, because it is a diagnostic/maintenance app for cars…) Do I really need to ask my clients to unpair from CarPlay before using our app or is there another way?
2
0
156
May ’25
Losing connection to the debugger in Xcode when a new configuration is pushed through MDM.
I pushed a configuration to my iPhone through MDM to run the content filter. However, when I modify the configuration by adding some vendor-configuration , I lose connection to the debugger and can no longer see logs or the updated configuration in Xcode. I have to build the app again. Could this be an issue with Xcode, or is it related to MDM or the configuration itself?
2
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127
Jun ’25
The network expansion process will become a zombie process and the network will be unusable.
Hi, I developed a network extension program on macOS. I tried to update the program by changing the version number. My update process was to first turn off network filtering via "NEFilterManager.sharedManager.enabled = NO", and then use "[OSSystemExtensionRequest activationRequestForExtension:bundleid queue:dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_HIGH, 0)];" to let the system replace the old network extension program. However, sometimes the old network extension process will become a zombie process like pid=86621 in the figure. As long as the zombie process exists, the network cannot be used. After about 10 minutes, it will be cleared and the network will be available. Restarting Wi-Fi can also clear the zombie process immediately. Why is this? How to avoid this problem?
1
0
129
Jun ’25
Packet Tunnel Provider with Per App VPN debugging
We have a vpn app which uses PacketTunnelProvider. We also support per-app vpn for iOS, I need help with debugging steps for an issue I am facing recently. In the per app vpn, we have split tunneling: some urls should be tunneled while others should be direct, for tunneled urls/ips everything is working as expected. But for "direct" resources, I am facing an issue where sometimes I don't get an ACK back from the browser. Leading to a series of retransmissions and eventually the direct website not loading. Some more points of data: we do get true for the writePackets call, which seems to mean that the vpn app did write the packets to the TUN interface, but we don't get an ACK from the browser. I want some way of debugging this further so I can check if the browser actually got the packets. I also suspect that there might be a loop with packets (we are reading the packets we just wrote onto TUN), but can't say for sure since the issue is intermittent, in case of a loop, I would expect it to always help. Any help would be greatly appreciated.
3
0
227
May ’25
"Local network prohibited" 2025 edition
I'm getting "unsatisfied (Local network prohibited)" when trying accessing my local http server running on mac (http://192.168.0.12:8000/test.txt) from an app running on iPhone with iOS 18.4. That's using URLSession, nothing fancy. This is the contents of the plist file of the app: NSAppTransportSecurity NSExceptionAllowsInsecureHTTPLoads true NSAllowsArbitraryLoads true NSAllowsLocalNetworking true NSExceptionDomains 192.168.0.12 NSIncludesSubdomains true NSAllowsLocalNetworking true NSExceptionAllowsInsecureHTTPLoads true NSLocalNetworkUsageDescription Hello The app correctly "prompts" the alert on the first app run, asking if I want to access local network, to which I say yes. Afterwards I could see that Local Network is enabled in iOS settings for the app, yet getting those "Local network prohibited" errors. From testing other global IP + 'http only" sites it feels like NSAllowsArbitraryLoads no longer works as it used to work before. But specifying other test "global" HTTP-only IP addresses in NSExceptionDomains work alright, it's just the local address doesn't. I could access that IP from iOS safari with no problem. The local web site is HTTP only. Googling reveals tons of relevant hits including FAQ articles from Quinn, but whatever I tried so far based on those hits doesn't seem to work.
3
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473
Jun ’25
I have an application that uses Network Extension, and it occasionally triggers a kernel panic, resulting in a complete system freeze.
{"bug_type":"210","timestamp":"2025-07-04 14:19:35.00 +0800","os_version":"macOS 15.5 (24F74)","roots_installed":0,"incident_id":"5457889A-1002-4389-BAE6-A447733EFD78"} { "build" : "macOS 15.5 (24F74)", "product" : "MacBookPro18,4", "socId" : "6001", "socRevision" : "11", "incident" : "5457889A-1002-4389-BAE6-A447733EFD78", "crashReporterKey" : "4ABE0CA2-C60B-8B0E-557A-C0BDEB1E9144", "kernel" : "Darwin Kernel Version 24.5.0: Tue Apr 22 19:54:49 PDT 2025; root:xnu-11417.121.62/RELEASE_ARM64_T6000", "date" : "2025-07-04 14:19:35.95 +0800", "panicString" : "panic(cpu 1 caller 0xfffffe00215f28e8): Kernel data abort. at pc 0xfffffe0021310d9c, lr 0x37a67e002116f050 (saved state: 0xfffffe60706d3240)\n\t x0: 0xfffffe2eaac676f8 x1: 0x0000000000000000 x2: 0xfffffe002116f050 x3: 0x0000000000000002\n\t x4: 0x0000000000002021 x5: 0xffffffffffffffff x6: 0x0000000000000000 x7: 0x0000006ddf79e068\n\t x8: 0xf9555cb919b50093 x9: 0x0000000000000000 x10: 0x0000000000000054 x11: 0x0000000000000000\n\t x12: 0xfffffe002477dfc8 x13: 0x0000000000000001 x14: 0x0000000000000052 x15: 0x0000000000000000\n\t x16: 0x0000020061052ad4 x17: 0x0000000000000001 x18: 0x0000000000000000 x19: 0xfffffe2eaa38d000\n\t x20: 0x0000000000000000 x21: 0xfffffe2eaac676f8 x22: 0x0000000000000020 x23: 0xfffffe2eab90f000\n\t x24: 0x000000001e22b50a x25: 0x0000000000000000 x26: 0x0000000000000000 x27: 0xfffffe2eab90efb4\n\t x28: 0x0000000000003500 fp: 0xfffffe60706d35b0 lr: 0x37a67e002116f050 sp: 0xfffffe60706d3590\n\t pc: 0xfffffe0021310d9c cpsr: 0x60401208 esr: 0xfffffe6096000006 far: 0x0000000000000068\n\nDebugger message: panic\nMemory ID: 0x6\nOS release type: User\nOS version: 24F74\nKernel version: Darwin Kernel Version 24.5.0: Tue Apr 22 19:54:49 PDT 2025; root:xnu-11417.121.62/RELEASE_ARM64_T6000\nFileset Kernelcache UUID: AF6531DB60D1EB2338126CF77682B8DE\nKernel UUID: CBC2F718-53E4-3C8D-BEC7-FB6DDC3318E1\nBoot session UUID: 5457889A-1002-4389-BAE6-A447733EFD78\niBoot version: iBoot-11881.121.1\niBoot Stage 2 version: iBoot-11881.121.1\nsecure boot?: YES\nroots installed: 0\nPaniclog version: 14\nKernelCache slide: 0x0000000018540000\nKernelCache base: 0xfffffe001f544000\nKernel slide: 0x0000000018548000\nKernel text base: 0xfffffe001f54c000\nKernel text exec slide: 0x0000000019ce0000\nKernel text exec base: 0xfffffe0020ce4000\nmach_absolute_time: 0x6ddf85c206\nEpoch Time: sec usec\n Boot : 0x686680ed 0x000c5ab2\n Sleep : 0x68676ff9 0x0005fdc0\n Wake : 0x68677007 0x000d2cfa\n Calendar: 0x68677252 0x00021537\n\nZone info:\n Zone map: 0xfffffe1016000000 - 0xfffffe3616000000\n . VM : 0xfffffe1016000000 - 0xfffffe15e2000000\n . RO : 0xfffffe15e2000000 - 0xfffffe187c000000\n . GEN0 : 0xfffffe187c000000 - 0xfffffe1e48000000\n . GEN1 : 0xfffffe1e48000000 - 0xfffffe2414000000\n . GEN2 : 0xfffffe2414000000 - 0xfffffe29e0000000\n . GEN3 : 0xfffffe29e0000000 - 0xfffffe2fac000000\n . DATA : 0xfffffe2fac000000 - 0xfffffe3616000000\n Metadata: 0xfffffe5e3a010000 - 0xfffffe5e43810000\n Bitmaps : 0xfffffe5e43810000 - 0xfffffe5e4f500000\n Extra : 0 - 0\n\nTPIDRx_ELy = {1: 0xfffffe28ded6aff0 0: 0x0000000000000001 0ro: 0x000000016fd330e0 }\nCORE 0 PVH locks held: None\nCORE 1 PVH locks held: None\nCORE 2 PVH locks held: None\nCORE 3 PVH locks held: None\nCORE 4 PVH locks held: None\nCORE 5 PVH locks held: None\nCORE 6 PVH locks held: None\nCORE 7 PVH locks held: None\nCORE 8 PVH locks held: None\nCORE 9 PVH locks held: None\nCORE 0: PC=0xfffffe0020f2d330, LR=0xfffffe0020f2d368, FP=0xfffffe60717cb460\nCORE 1 is the one that panicked. Check the full backtrace for details.\nCORE 2: PC=0xfffffe0020d81094, LR=0xfffffe0020d81094, FP=0xfffffe607167bed0\nCORE 3: PC=0xfffffe0020d81094, LR=0xfffffe0020d81094, FP=0xfffffe60725d3ed0\nCORE 4: PC=0xfffffe0020d81094, LR=0xfffffe0020d81094, FP=0xfffffe6072bafed0\nCORE 5: PC=0xfffffe0020d81094, LR=0xfffffe0020d81094, FP=0xfffffe6072197ed0\nCORE 6: PC=0xfffffe0020d81094, LR=0xfffffe0020d81094, FP=0xfffffe60727abed0\nCORE 7: PC=0xfffffe0020d81094, LR=0xfffffe0020d81094, FP=0xfffffe6071897ed0\nCORE 8: PC=0xfffffe0020d81094, LR=0xfffffe0020d81094, FP=0xfffffe607149bed0\nCORE 9: PC=0xfffffe0020d81094, LR=0xfffffe0020d81094, FP=0xfffffe607214bed0\nCompressor Info: 0% of compressed pages limit (OK) and 0% of segments limit (OK) with 0 swapfiles and OK swap space\nPanicked task 0xfffffe1d4729c7a0: 1925 pages, 14 threads: pid 36674: com.TE.TEDataCloak.ne\nPanicked thread: 0xfffffe28ded6aff0, backtrace: 0xfffffe60706d28f0, tid: 743602\n\t\t lr: 0xfffffe0020d432b4 fp: 0xfffffe60706d2980\n\t\t lr: 0xfffffe0020ea52f8 fp: 0xfffffe60706d29f0\n\t\t lr: 0xfffffe0020ea3554 fp: 0xfffffe60706d2ab0\n\t\t lr: 0xfffffe0020cebb98 fp: 0xfffffe60706d2ac0\n\t\t lr: 0xfffffe0020d42b98 fp: 0xfffffe60706d2e90\n\t\t lr: 0xfffffe00215e7388 fp: 0xfffffe60706d2eb0\n\t\t lr: 0xfffffe00215f28e8 fp: 0xfffffe60706d30c0\n\t\t lr: 0xfffffe0020ea5154 fp: 0xfffffe60706d3160\n\t\t lr: 0xfffffe0020ea36c8 fp: 0xfffffe60706d3220\n\t\t lr: 0xfffffe0020cebb98 fp: 0xfffffe60706d3230\n\t\t lr: 0xfffffe002116f050 fp: 0xfffffe60706d35b0\n\t\t lr: 0xfffffe002116f050 fp: 0xfffffe60706d3730\n\t\t lr: 0xfffffe002116de88 fp: 0xfffffe60706d3780\n\t\t lr: 0xfffffe0021180174 fp: 0xfffffe60706d3810\n\t\t lr: 0xfffffe002117ea94 fp: 0xfffffe60706d38d0\n\t\t lr: 0xfffffe002117d69c fp: 0xfffffe60706d3a30\n\t\t lr: 0xfffffe0021281400 fp: 0xfffffe60706d3a80\n\t\t lr: 0xfffffe00213146dc fp: 0xfffffe60706d3c10\n\t\t lr: 0xfffffe0021324ff8 fp: 0xfffffe60706d3d00\n\t\t lr: 0xfffffe0021325580 fp: 0xfffffe60706d3de0\n\t\t lr: 0xfffffe00213edc24 fp: 0xfffffe60706d3e50\n\t\t lr: 0xfffffe0020ea35dc fp: 0xfffffe60706d3f10\n\t\t lr: 0xfffffe0020cebb98 fp: 0xfffffe60706d3f20\n\t\t lr: 0xfffffe0020cebb60 fp: 0x0000000000000000\n\nlast started kext at 3810289154: com.apple.filesystems.smbfs\t6.0 (addr 0xfffffe00200f68e0, size 111737)\nloaded kexts:\ncom.paragon-
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Jul ’25
Bonjour for discovering a specific device's ip
Hi, I'm new to swift programming and right now writing an app for esp8266-controlled lamp device. My lamp is broadcasting it's own IP through bonjour. So all I want is to discover any lamps in my network (http.tcp) and to read name and value. Is there any example of such implementation? All I found so far is old or a lit bit complicated for such simple question. Thanks in advance!
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Dec ’25
Questions on Device Pairing with DeviceDiscoveryUI in Wi-Fi Aware
At WWDC 25, Dr. Swetank mentioned, “DeviceDiscoveryUI is for making connections between apps and from an app to another device. It supports pairing with both Apple and third-party devices.” I find the pairing process in DeviceDiscoveryUI via Wi-Fi Aware intriguing. I have two questions: Can we pair devices via Bluetooth first and then establish a Wi-Fi Aware connection? If I use DeviceDiscoveryUI, how should I write an Android program to correspond with it and achieve iPhone-Android pairing? The app is an official Apple app: https://developer.apple.com/documentation/wifiaware/building-peer-to-peer-apps.
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Activity
Jul ’25
Crash in URLConnectionLoader::loadWithWhatToDo
There are multiple report of crashes on URLConnectionLoader::loadWithWhatToDo. The crashed thread in the stack traces pointing to calls inside CFNetwork which seems to be internal library in iOS. The crash has happened quite a while already (but we cannot detect when the crash started to occur) and impacted multiple iOS versions recorded from iOS 15.4 to 18.4.1 that was recorded in Xcode crash report organizer so far. Unfortunately, we have no idea on how to reproduce it yet but the crash keeps on increasing and affect more on iOS 18 users (which makes sense because many people updated their iOS to the newer version) and we haven’t found any clue on what actually happened and how to fix it on the crash reports. What we understand is it seems to come from a network request that happened to trigger the crash but we need more information on what (condition) actually cause it and how to solve it. Hereby, I attach sample crash report for both iOS 15 and 18. I also have submitted a report (that include more crash reports) with number: FB17775979. Will appreciate any insight regarding this issue and any resolution that we can do to avoid it. iOS 15.crash iOS 18.crash
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Activity
Jan ’26
Network Extension – Delayed Startup Time
I've implemented a custom VPN system extension for macOS, utilizing Packet Tunnel Provider. One of the users reported a problem: he was connected to the VPN, and then his Mac entered sleep mode. Upon waking, the VPN is supposed to connect automatically (because of the on-demand rules). The VPN's status changed to 'connecting', but it remained stuck in this status. From my extension logs, I can see that the 'startTunnelWithOption()' function was called 2 minutes after the user clicked the 'connect' button. From the system logs, I noticed some 'suspicious' logs, but I can't be sure if they are related to the problem. Some of them are: kernel: (Sandbox) Sandbox: nesessionmanager(562) deny(1) system-fsctl (_IO "h" 47) entitlement com.apple.developer.endpoint-security.client not present or not true (I don't need this entitlement at the extension) nesessionmanager: [com.apple.networkextension:] NESMVPNSession[Primary Tunnel:XXXXXX(null)]: Skip a start command from YYYYY:session in state connecting NetworkExtension.com.***: RunningBoard doesn't recognize submitted process - treating as a anonymous process sysextd: activateDecision found existing entry of same version: state activated_enabled, ID FAE... Are any of the logs related to the above problem? How can I debug such issues? What info should I get from the user?
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Oct ’25
Extra-ordinary Networking
Most apps perform ordinary network operations, like fetching an HTTP resource with URLSession and opening a TCP connection to a mail server with Network framework. These operations are not without their challenges, but they’re the well-trodden path. If your app performs ordinary networking, see TN3151 Choosing the right networking API for recommendations as to where to start. Some apps have extra-ordinary networking requirements. For example, apps that: Help the user configure a Wi-Fi accessory Require a connection to run over a specific interface Listen for incoming connections Building such an app is tricky because: Networking is hard in general. Apple devices support very dynamic networking, and your app has to work well in whatever environment it’s running in. Documentation for the APIs you need is tucked away in man pages and doc comments. In many cases you have to assemble these APIs in creative ways. If you’re developing an app with extra-ordinary networking requirements, this post is for you. Note If you have questions or comments about any of the topics discussed here, put them in a new thread here on DevForums. Make sure I see it by putting it in the App & System Services > Networking area. And feel free to add tags appropriate to the specific technology you’re using, like Foundation, CFNetwork, Network, or Network Extension. Links, Links, and More Links Each topic is covered in a separate post: The iOS Wi-Fi Lifecycle describes how iOS joins and leaves Wi-Fi networks. Understanding this is especially important if you’re building an app that works with a Wi-Fi accessory. Network Interface Concepts explains how Apple platforms manage network interfaces. If you’ve got this far, you definitely want to read this. Network Interface Techniques offers a high-level overview of some of the more common techniques you need when working with network interfaces. Network Interface APIs describes APIs and core techniques for working with network interfaces. It’s referenced by many other posts. Running an HTTP Request over WWAN explains why most apps should not force an HTTP request to run over WWAN, what they should do instead, and what to do if you really need that behaviour. If you’re building an iOS app with an embedded network server, see Showing Connection Information in an iOS Server for details on how to get the information to show to your user so they can connect to your server. Many folks run into trouble when they try to find the device’s IP address, or other seemingly simple things, like the name of the Wi-Fi interface. Don’t Try to Get the Device’s IP Address explains why these problems are hard, and offers alternative approaches that function correctly in all network environments. Similarly, folks also run into trouble when trying to get the host name. On Host Names explains why that’s more complex than you might think. If you’re working with broadcasts or multicasts, see Broadcasts and Multicasts, Hints and Tips. If you’re building an app that works with a Wi-Fi accessory, see Working with a Wi-Fi Accessory. If you’re trying to gather network interface statistics, see Network Interface Statistics. There are also some posts that are not part of this series but likely to be of interest if you’re working in this space: TN3179 Understanding local network privacy discusses the local network privacy feature. Calling BSD Sockets from Swift does what it says on the tin, that is, explains how to call BSD Sockets from Swift. When doing weird things with the network, you often find yourself having to use BSD Sockets, and that API is not easy to call from Swift. The code therein is primarily for the benefit of test projects, oh, and DevForums posts like these. TN3111 iOS Wi-Fi API overview is a critical resource if you’re doing Wi-Fi specific stuff on iOS. TLS For Accessory Developers tackles the tricky topic of how to communicate securely with a network-based accessory. A Peek Behind the NECP Curtain discusses NECP, a subsystem that control which programs have access to which network interfaces. Networking Resources has links to many other useful resources. Share and Enjoy — Quinn “The Eskimo!” @ Developer Technical Support @ Apple let myEmail = "eskimo" + "1" + "@" + "apple.com" Revision History 2025-07-31 Added a link to A Peek Behind the NECP Curtain. 2025-03-28 Added a link to On Host Names. 2025-01-16 Added a link to Broadcasts and Multicasts, Hints and Tips. Updated the local network privacy link to point to TN3179. Made other minor editorial changes. 2024-04-30 Added a link to Network Interface Statistics. 2023-09-14 Added a link to TLS For Accessory Developers. 2023-07-23 First posted.
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Jul ’25
Performance Concerns and Dynamic Control of Parallel Image Uploads Using Swift TaskGroup
I'm currently developing an iOS app with image upload functionality. To enhance upload speed, I'm considering implementing parallel uploads using Swift’s TaskGroup. However, I have concerns that in environments with limited bandwidth, parallelization might introduce overhead and contention, ultimately slowing down uploads instead of improving them. Specifically, I'm curious about: Is this concern valid? Does parallelizing uploads become counterproductive in low-bandwidth conditions due to overhead and network contention? If so, I'm considering dynamically adjusting the concurrency level based on network conditions. Does anyone have experience or best practices regarding such an approach? Any insights or advice would be greatly appreciated. Thank you!
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Activity
Jun ’25
Incoming UDP Traffic in macOS 15.3 and later?
[Q] Has there been a change in macOS 15.3.2 and later that can explain why some UDP traffic is not seen by some Network Extensions when it is in previous macOS minor and major versions?
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Activity
Jul ’25
Using NEVPNManager to detect VPN status and consistently returning NEVPNStatusInvalid
Hello! My app wants to disable VPN connection. I used the loadFromPreferencesWithCompletionHandler method of NEVPNManager for detection, but regardless of whether the VPN was actually connected or not, it kept returning NEVPNStatusInvalid. How should I handle this issue? NEVPNManager *vpnManager = [NEVPNManager sharedManager]; [vpnManager loadFromPreferencesWithCompletionHandler:^(NSError * _Nullable error) { if (error) { return; } NEVPNStatus status = vpnManager.connection.status; switch (status) { case NEVPNStatusInvalid: // kept returning NEVPNStatusInvalid break; case NEVPNStatusDisconnected: break; case NEVPNStatusConnecting: break; case NEVPNStatusConnected: break; case NEVPNStatusReasserting: break; case NEVPNStatusDisconnecting: break; default: break; } }];
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Jun ’25
NWBrowser scan for arbitrary Bonjour Services with Multicast Entitlement ?!
Dear Girls, Guys and Engineers. I'm currently building a Home Network Scanner App for People which want to know which Bonjour Devices are in her/his Home Network environment. From an older Question I got the answer, that I need an Entitlement to do this. I started to work on the App and requested the Multicast Entitlement from Apple. They gave me the Entitlement for my App and now I'm trying to discover all devices in my Home Network but I got stuck and need Help. I only test direct on device, like the recommendation. I also verified that my app is build with the multicast entitlement there where no problems. My problem is now, that is still not possible to discover all Bonjour services in my Home Network with the Help of the NWBrowser. Can you please help me to make it work ? I tried to scan for the generic service type: let browser = NWBrowser(for: .bonjour(type: "_services._dns-sd._udp.", domain: nil), using: .init()) but this is still not working even tough I have the entitlement and the app was verified that the entitlement is correctly enabled if I scan for this service type, I got the following error: [browser] nw_browser_fail_on_dns_error_locked [B1] Invalid meta query type specified. nw_browser_start_dns_browser_locked failed: BadParam(-65540) So what's the correct way now to find all devices in the home network ? Thank you and best regards Vinz
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Jun ’25
Disable Local Network Access permission check
I'm using a Mac Studio in a homelab context and use Homebrew to manage the installed services. The services include things that access the local network, for example Prometheus which monitors some other servers, a reverse proxy which fronts other web services on the network, and a DNS server which can use another as upstream. Local Network Access permissions make it impossible to reliably perform unattended updates of services because an updated binary requires a GUI login to grant local network permissions (again). I use brew services to manage the services as launchd agents, i.e. they run in a non-root GUI context. I know that I can also use sudo brew services which instead installs the services as launchd daemons, but running services as root has negative security implication and generally doesn't look like a good idea to me. If only there was a way to disable local network access checks altogether…
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Feb ’26
NWBrowser with bonjour returning PolicyDenied(-65570)
Hi, Having an issue on one mac using Xcode 16.3 and simulator 18.4. macSO 15.4 We are checking for bonjour: authorizationBrowser = NWBrowser(for: .bonjour(type: "_bonjour._tcp", domain: nil), using: parameters) authorizationBrowser?.stateUpdateHandler = { [weak self] newState in switch newState { ... } } However at the command line we get the error: nw_browser_fail_on_dns_error_locked [B1] nw_browser_dns_service_browse_callback failed: PolicyDenied(-65570) Any idea why this is happening? or what this error means? Thanks Antz
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Jun ’25
Crash in URLSessionConfiguration init in Xcode 26.0 beta (17A5241e)
It's not yet fully clear why and when does this crash occur, but I'm creating this post so there's a centralized thread for this. Some hints collected so far: The crash is occurring for existing Xcode projects opened with new Xcode 26.0 beta (17A5241e); no one's been able to reproduce on a project created in Xcode 26. I even tried creating a project with Xcode 16.2 and open it in Xcode 26, but it's all working fine there (don't have older Xcode at the moment, to try with many versions) It crashes right at the line of code that initializes URLSessionConfiguration. If you call URLSession() without parameters (which is deprecated as of iOS 13), the session initializes without the crash. It's NOT occurring only for libraries installed through package manages. In a project where it crashes, one should be able to reproduce by adding URLSessionConfiguration.default as the first line in didFinishLaunchingWithOptions It crashes when running an app on an iOS 26 simulator. (I don't have a device running beta iOS 26 to test on it!) It's working fine when running the app on a simulator or a device running iOS 18 or older. Related issue on Firebase GitHub repo: https://github.com/firebase/firebase-ios-sdk/issues/14948 Sorry to not be able to provide more info at the moment. I wanted to report this so in case someone from Apple knows about it, we could at least get some feedback or workarounds, until fix is released -- and, to prevent us all from duplicating this report in repositories of each library, as this isn't related to libraries.
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Aug ’25
XPC Connection with Network Extension fails after upgrade
Hi Team, I have a Network Extension application and UI frontend for it. The UI frontend talks to the Network Extension using XPC, as provided by NEMachServiceName. On M2 machine, The application and XPC connection works fine on clean installation. But, when the application is upgraded, the XPC connection keeps failing. Upgrade steps: PreInstall script kills the running processes, both UI and Network Extension Let installation continue PostInstall script to launch the application after installation complete. Following code is successful to the point of resume from UI application NSXPCInterface *exportedInterface = [NSXPCInterface interfaceWithProtocol:@protocol(IPCUIObject)]; newConnection.exportedInterface = exportedInterface; newConnection.exportedObject = delegate; NSXPCInterface *remoteObjectInterface = [NSXPCInterface interfaceWithProtocol:@protocol(IPCExtObject)]; newConnection.remoteObjectInterface = remoteObjectInterface; self.currentConnection = newConnection; [newConnection resume]; But it fails to get the object id<IPCExtObject> providerProxy = [self.currentConnection remoteObjectProxyWithErrorHandler:^(NSError *registerError) { }]; Please note, this only fails for M2. For M1, this exact code is running fine. Additionally, if I uninstall the application by dropping it in Trash and then installing the newer version, then too, the application works fine.
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Dec ’25
CallKit and PushToTalk related changes in iOS 26
Starting in iOS 26, two notable changes have been made to CallKit, LiveCommunicationKit, and the PushToTalk framework: As a diagnostic aid, we're introducing new dialogs to warn apps of voip push related issue, for example when they fail to report a call or when when voip push delivery stops. The specific details of that behavior are still being determined and are likely to change over time, however, the critical point here is that these alerts are only intended to help developers debug and improve their app. Because of that, they're specifically tied to development and TestFlight signed builds, so the alert dialogs will not appear for customers running app store builds. The existing termination/crashes will still occur, but the new warning alerts will not appear. As PushToTalk developers have previously been warned, the last unrestricted PushKit entitlement ("com.apple.developer.pushkit.unrestricted-voip.ptt") has been disabled in the iOS 26 SDK. ALL apps that link against the iOS 26 SDK which receive a voip push through PushKit and which fail to report a call to CallKit will be now be terminated by the system, as the API contract has long specified. __ Kevin Elliott DTS Engineer, CoreOS/Hardware
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Jun ’25
CarPlay vs. AccessoryKit & NEHotspotHelper
CarPlay woes. I think it's unacceptable that it silently kills an ongoing WiFi connection that has been established using ASAccessoryKit and NEHotspotHelper which is in active use. This is responsible for angry clients because their processes break a lot when they are in reach of the connected car. (And yes, they have to be in the reach of the car, because it is a diagnostic/maintenance app for cars…) Do I really need to ask my clients to unpair from CarPlay before using our app or is there another way?
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May ’25
Losing connection to the debugger in Xcode when a new configuration is pushed through MDM.
I pushed a configuration to my iPhone through MDM to run the content filter. However, when I modify the configuration by adding some vendor-configuration , I lose connection to the debugger and can no longer see logs or the updated configuration in Xcode. I have to build the app again. Could this be an issue with Xcode, or is it related to MDM or the configuration itself?
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Jun ’25
The network expansion process will become a zombie process and the network will be unusable.
Hi, I developed a network extension program on macOS. I tried to update the program by changing the version number. My update process was to first turn off network filtering via "NEFilterManager.sharedManager.enabled = NO", and then use "[OSSystemExtensionRequest activationRequestForExtension:bundleid queue:dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_HIGH, 0)];" to let the system replace the old network extension program. However, sometimes the old network extension process will become a zombie process like pid=86621 in the figure. As long as the zombie process exists, the network cannot be used. After about 10 minutes, it will be cleared and the network will be available. Restarting Wi-Fi can also clear the zombie process immediately. Why is this? How to avoid this problem?
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Jun ’25
Packet Tunnel Provider with Per App VPN debugging
We have a vpn app which uses PacketTunnelProvider. We also support per-app vpn for iOS, I need help with debugging steps for an issue I am facing recently. In the per app vpn, we have split tunneling: some urls should be tunneled while others should be direct, for tunneled urls/ips everything is working as expected. But for "direct" resources, I am facing an issue where sometimes I don't get an ACK back from the browser. Leading to a series of retransmissions and eventually the direct website not loading. Some more points of data: we do get true for the writePackets call, which seems to mean that the vpn app did write the packets to the TUN interface, but we don't get an ACK from the browser. I want some way of debugging this further so I can check if the browser actually got the packets. I also suspect that there might be a loop with packets (we are reading the packets we just wrote onto TUN), but can't say for sure since the issue is intermittent, in case of a loop, I would expect it to always help. Any help would be greatly appreciated.
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May ’25
"Local network prohibited" 2025 edition
I'm getting "unsatisfied (Local network prohibited)" when trying accessing my local http server running on mac (http://192.168.0.12:8000/test.txt) from an app running on iPhone with iOS 18.4. That's using URLSession, nothing fancy. This is the contents of the plist file of the app: NSAppTransportSecurity NSExceptionAllowsInsecureHTTPLoads true NSAllowsArbitraryLoads true NSAllowsLocalNetworking true NSExceptionDomains 192.168.0.12 NSIncludesSubdomains true NSAllowsLocalNetworking true NSExceptionAllowsInsecureHTTPLoads true NSLocalNetworkUsageDescription Hello The app correctly "prompts" the alert on the first app run, asking if I want to access local network, to which I say yes. Afterwards I could see that Local Network is enabled in iOS settings for the app, yet getting those "Local network prohibited" errors. From testing other global IP + 'http only" sites it feels like NSAllowsArbitraryLoads no longer works as it used to work before. But specifying other test "global" HTTP-only IP addresses in NSExceptionDomains work alright, it's just the local address doesn't. I could access that IP from iOS safari with no problem. The local web site is HTTP only. Googling reveals tons of relevant hits including FAQ articles from Quinn, but whatever I tried so far based on those hits doesn't seem to work.
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Jun ’25