General: Forums subtopic: App & System Services > Networking DevForums tag: Network Extension Network Extension framework documentation Routing your VPN network traffic article Filtering traffic by URL sample code Filtering Network Traffic sample code TN3120 Expected use cases for Network Extension packet tunnel providers technote TN3134 Network Extension provider deployment technote TN3165 Packet Filter is not API technote Network Extension and VPN Glossary forums post Debugging a Network Extension Provider forums post Exporting a Developer ID Network Extension forums post Network Extension Framework Entitlements forums post Network Extension vs ad hoc techniques on macOS forums post Network Extension Provider Packaging forums post NWEndpoint History and Advice forums post Extra-ordinary Networking forums post Wi-Fi management: Wi-Fi Fundamentals forums post TN3111 iOS Wi-Fi API overview technote How to modernize your captive network developer news post iOS Network Signal Strength forums post See also Networking Resources. Share and Enjoy — Quinn “The Eskimo!” @ Developer Technical Support @ Apple let myEmail = "eskimo" + "1" + "@" + "apple.com"

Description Our NETransparentProxyProvider system extension maintains a persistent TLS/DTLS control channel to a security gateway. To maintain this stateful connection the extension sends application-level "Keep Alive" packets every few seconds (example : 20 seconds). The Issue: When the macOS device enters a sleep state, the Network Extension process is suspended, causing our application-level heartbeat to cease. Consequently, our backend gateway—detecting no activity—terminates the session via Dead Peer Detection (DPD). The problem is exacerbated by macOS Dark Wake cycles. We observe the extension's wake() callback being triggered periodically (approx. every 15 minutes) while the device remains in a sleep state (lid closed). During these brief windows: The extension attempts to use the existing socket, finds it terminated by the backend, and initiates a full re-handshake. Shortly after the connection is re-established, the OS triggers the sleep() callback and suspends the process again. This creates a "connection churn" cycle that generates excessive telemetry noise and misleading "Session Disconnected" alerts for our enterprise customers. Steps to Reproduce Activate Proxy: Start the NETransparentProxyProvider and establish a TLS session to a gateway. Apply Settings: Configure NETransparentProxyNetworkSettings to intercept outbound TCP/UDP traffic. Initialize Heartbeat: Start a 20-second timer (DispatchSourceTimer) to log and send keep-alive packets. Induce Sleep: Put the Mac to sleep (Apple Menu > Sleep). Observe Logs: Monitor the system via sysdiagnose or the macOS Console. Observation: Logs stop entirely during sleep, indicating process suspension. Observation: wake() and sleep() callbacks are triggered repeatedly during Dark Wake intervals, causing a cycle of re-connections. Expected Behavior We seek to minimize connection turnover during maintenance wakes and maintain session stability while the device is technically in a sleep state. Questions for Apple Is it possible to suppress the sleep and wake callback methods of NETransparentProxyProvider when the device is performing a maintenance/Dark Wake, only triggering them for a full user-initiated wake? Is it possible to prevent the NETransparentProxyProvider process from being suspended during sleep, or at least grant it a high-priority background execution slot to maintain the heartbeat? If suspension is mandatory, is there a recommended way to utilize TCP_KEEPALIVE socket options that the kernel can handle on behalf of the suspended extension? How can the extension programmatically identify if a wake() call is a "Dark Wake" versus a "Full User Wake" to avoid unnecessary re-connection logic?

We are developing a macOS VPN application using NEPacketTunnelProvider with a custom encryption protocol. We are using standard On-Demand VPN rules with Wi-Fi SSID matching but we want to add some additional feature to the native behaviour.  We want to control the 'conenect/disconnect' button status and allow the user to interact with the tunnel even when the on demand rule conditions are satisfied, is there a native way to do it? In case we need to implement our custom on-demand behaviour we need to access to this information: connected interface type ssid name and being informed when it changes so to trigger our logic, how to do it from the app side? we try to use CWWiFiClient along with ssidDidChangeForWiFiInterface monitoring, it returns just the interface name en0 and not the wifi ssid name. Is location access mandatory to access wifi SSID on macOS even if we have a NEPacketTunnelProvider? Please note that we bundle our Network Extension as an App Extension (not SystemExtension).

Case-ID: 17935956 In the NetworkExtension framework, for the NETransparentProxyProvider and NEDNSProxyProvider classes: when calling the open func writeDatagrams(_ datagrams: [Data], sentBy remoteEndpoints: [NWEndpoint]) async throwsin the NEDNSProxyProvider class, and the open func write(_ data: Data, withCompletionHandler completionHandler: @escaping @Sendable ((any Error)?) -> Void)in the NETransparentProxyProvider class, errors such as "The operation could not be completed because the flow is not connected" and "Error Domain=NEAppProxyFlowErrorDomain Code=1 "The operation could not be completed because the flow is not connected"" occur. Once this issue arises, if it occurs in the NEDNSProxyProvider, the entire system's DNS will fail to function properly; if it occurs in the NETransparentProxyProvider, the entire network will become unavailable.

I added a Content Filter to my app, and when running it in Xcode (Debug/Release), I get the expected permission prompt: "Would like to filter network content (Allow / Don't Allow)". However, when I install the app via TestFlight, this prompt doesn’t appear at all, and the feature doesn’t work. Is there a special configuration required for TestFlight? Has anyone encountered this issue before? Thanks!

I’m working on an iOS VPN app and looking into using NETunnelProvider (Packet Tunnel) for the VPN implementation. From the documentation it seems that Packet Tunnel is required for VPN protocols like OpenVPN, but the Packet Tunnel capability doesn’t appear to be available by default. Does using NETunnelProvider / Packet Tunnel require a special entitlement to be enabled by Apple for App Store apps? If so, what is the general process for requesting or enabling that entitlement?

Hi Apple engineers! We are making an iOS browser and are planing to deliver a feature that allows enterprise customers to use a MAM key to set a PAC file for proxy. It's designed to support unmanaged device so the MDM based solutions like 'Global HTTP Proxy MDM payload' or 'Per-App VPN' simply don't work. After doing some research we found that with WKWebView, the only framework allowed on iOS for web browsing, there's no API for programmatically setting proxy. The closes API is the WKURLSchemeHandler, but it's for data management not network request interception, in other word it can not be used to handle HTTP/HTTPS request well. When we go from the web-view level to the app level, it seems there's no API to let an app set proxy for itself at an app-level, the closest API is Per-App VPN but as mentioned above, Per-App VPN is only available for managed device so we can't use that as well. Eventually we go to the system level, and try to use Network Extension, but there's still obstacles. It seems Network Extension doesn't directly provide a way to write system proxy. In order to archive that, we may have to use Packet Tunnel Provider in destination IP mode and create a local VPN server to loop back the network traffic and do the proxy stuff in that server. In other word, the custom VPN protocol is 'forward directly without encryption'. This approach looks viable as we see some of the network analysis tools use this approach, but still I'd like to ask is this against App Store Review Guidelines? If the above approach with Network Extension is not against App Store Review Guidelines, I have a further question that, what is the NEProxySettings of NETunnelNetworkSettings for? Is it the proxy which proxies the VPN traffic (in order to hide source IP from VPN provider) or it is the proxy to use after network traffic goes into the virtual private network? If none of the above is considered recommended, what is the recommended way to programmatically set proxy on WKWebView on an unmanaged device (regardless of where the proxy runs, web-view/app/system)?

Tags NetworkExtension, NEFilterManager, Content-Filter, TestFlight, iOS, Swift, Entitlements, App-Groups Problem Summary I'm experiencing a critical issue with a Network Extension Content Filter that works perfectly in debug mode but fails in TestFlight with: ``` -[NEFilterManager saveToPreferencesWithCompletionHandler:]_block_invoke_3: failed to save the new configuration: Error Domain=NEFilterErrorDomain Code=5 "permission denied" UserInfo={NSLocalizedDescription=permission denied} ``` This is blocking completion of a client project and requires urgent assistance. Environment • Platform: iOS • Minimum Deployment: iOS 16.0 • Development: Xcode with Flutter integration • Testing Method: TestFlight (production build) • Works in: Debug mode (direct device deployment) • Fails in: TestFlight builds What Works vs. What Fails WORKS IN DEBUG MODE (✓): • Network extension installs successfully • System permission dialog appears correctly • Filter starts and blocks content as expected • All domain management functions work FAILS IN TESTFLIGHT (✗): • System permission dialog never appears • NEFilterManager.saveToPreferences fails immediately • Error Code 5: "permission denied" • Cannot set up the filter at all Implementation Details ARCHITECTURE: The implementation consists of: Main App (Flutter) - handles UI and configuration Network Extension Plugin (Swift) - bridges Flutter to NetworkExtension framework FilterDataProvider (Swift) - implements content filtering logic App Group - shared storage for configuration (group.app.v1.dev0) PERMISSION REQUEST CODE: ```swift func requestPermissions(completion: @escaping (Result<Bool, Error>) -> Void) { NEFilterManager.shared().loadFromPreferences { error in if let error = error { DispatchQueue.main.async { completion(.failure(error)) } return } let config = NEFilterProviderConfiguration() config.organization = "Testing config.filterBrowsers = true config.filterSockets = true let manager = NEFilterManager.shared() manager.providerConfiguration = config manager.localizedDescription = " Screen Shield" manager.isEnabled = true manager.saveToPreferences { saveError in DispatchQueue.main.async { completion(saveError == nil ? .success(true) : .failure(saveError!)) } } } } ``` EXTENSION INFO.PLIST: ```xml ENTITLEMENTS: ```xml What I've Already Tried VERIFIED ENTITLEMENTS (✓) • Both main app and extension have matching entitlements • App Group identifier is identical in both targets • content-filter-provider capability is set CHECKED PROVISIONING PROFILES (✓) • Created distribution provisioning profiles with Network Extension capability • App Group is included in all profiles • All capabilities are enabled in App Store Connect VERIFIED APP GROUP CONFIGURATION (✓) • App Group exists in Apple Developer portal • Added to both App ID and Extension App ID • Regenerated provisioning profiles after adding CODE SIGNING (✓) • Both targets build and sign successfully • No code signing errors during archive • Extension is embedded in main app bundle TESTFLIGHT REQUIREMENTS (✓) • Using distribution certificate for archive • Archive validation passes without warnings • Upload to TestFlight successful BUILD CONFIGURATION (✓) • Minimum deployment target is iOS 16.0 for both targets • Extension deployment target matches main app • All required frameworks are properly linked Specific Questions Permission Dialog: In debug mode, the system permission dialog appears. In TestFlight, it never shows. Is there a TestFlight-specific permission issue with Network Extensions? Entitlements Propagation: Are there known issues with entitlements not being properly included in TestFlight builds despite being present in the archive? Distribution vs Development: Are there any differences in how Network Extensions are authorized between development builds and distribution builds? Additional Context • The extension works flawlessly when deployed directly from Xcode • No console errors or warnings in TestFlight build • UserDefaults(suiteName:) successfully accesses the App Group in both modes • Filter logic itself is tested and working (confirmed in debug mode) • This is urgent as it's blocking client project completion I tested this with both adult acc and also with child app What I Need Specific steps to diagnose why NEFilterManager.saveToPreferences returns Code 5 in TestFlight Confirmation of whether Network Extension entitlements require special handling for TestFlight Any known issues or workarounds for this specific error in production builds Debugging techniques that work in TestFlight environment (since console logs are limited) System Information • Xcode Version: Latest stable • iOS Target: 16.0+ • Swift Version: 5.0 • Framework: Flutter with native iOS plugin • Build Type: Distribution (Ad Hoc via TestFlight) Thank you for any assistance. This is blocking critical client work and I need to resolve it urgently.

Hi, After the release of macOS Tahoe 26.2. We are seeing memory leaks if our Network Protection Extension is used alongside the Apple Built In Firewall, a second Security Solution that does Network Protection and a VPN. Our NEXT, socketfilterfw and the other security solution consume instead of a few MB of Memory now multiple Gigabytes of Memory. This issue started with the public release of macOS Tahoe 26.2, this issue was not present in earlier versions of macOS and the same set of Software. Just testing our solution by itself will not show this behavior. I unfortunately can't try to reproduce the issue on my test device that runs the latest 26.3 beta as I do not have the third party software installed there and I can't get it. Our Network extension implements depending on the license and enabled features: NEFilterDataProvider NEDNSProxyProvider NETransparentProxyProvider For all man in the middle Use Cases we are using Network Framework, to communicate with the peers. And leaks suggest that the there is a memory leak within internals of the Network Framework. Here is a shortened sample of the leaks output of our Network extension. However, the third party NEXT does show the same leaks. More details can be found on the Feedback with the ID FB21649104 snippet is blocking post? sensitive language Does anyone see similar issues or has an idea what could cause this issue, except a regression of the Network.framework introduced with macOS Tahoe 26.2? Best Regards, Timo

I have noticed race conditions on macOS when tearing down and re-configuring an NEPacketTunnelProvider. My goal is to handle switching out one VPN profile for another identical/near identical one (I'll add some context for this below). The flow that I have tested was to wait for the NEVPNStatusDidChange notification to report a NEVPNStatus.disconnected state, and then start the process of re-configuring the VPN with a new profile. In practice however, I have noticed that I must wait a couple of seconds between NEVPNStatus.disconnected state being reported and setting up a new tunnel. Otherwise, the system routing table gets messed up but the VPN reports being in NEVPNStatus.connected state, resulting in a tunnel that appears healthy but can't be accessed. With this, I wanted to ask if you have any suggestions on any OS items I can observer, in order to deterministically know that the system has fully cleaned up my packet tunnel, and that I am safe to configure another? This would be much more optimal than a hard-coded delay. Additional context: Jamf is a common solution for deploying MDM configuration profiles. However, in my tests, it doesn't support Apple's recommended approach of using the PayloadIdentifier to mark profiles for replacement, as PayloadIdentifiers are automatically updated to match the PayloadUUID of that same profile on upload. Although given what I've observed, I'm not sure the Apple recommended approach would work here in any case. Additionally, it would be nice to transition from non-MDM to MDM cleanly, however, this also requires an indeterminate wait time between the non-MDM configuration being disconnected and subsequently removed, and the MDM one being configured. With these scenarios, we need to be able to add a second configuration, with possibly identical VPN settings, then remove the old one, allowing the system to transition to the new configuration. For the MDM case, the pattern I've noticed on the system is that when the current profile is suddenly deleted, the connection will go into disconnected state, then NEVPNConfigurationChange will fire. The new profile can be configured from NEVPNConfigurationChange, however some time is needed to avoid races. For non-MDM, I had experimented with an approach of polling for MDM configurations appearing. When they do, I'd remove my previous notification observers, and set up a new NEVPNStatusDidChange notification observer, to remove the non-MDM VPN configuration after. it enters a disconnected state. Following the removal, I would call a function to reconfigure the VPN with new configuration. When this logic is in place, the call to stopVPNTunnel() is made. Again, a hardcoded delay is required between stopping and removing the old configuration and setting up a new one. Thanks!

We create custom VPN tunnel by overriding PacketTunnelProvider on MacOS. Normal VPN connection works seamlessly. But if we enable onDemand rules on VPN manager, intemittently during tunnel creation via OnDemand, internet goes away on machine leading to a connection stuck state. Why does internet goes away during tunnel creation?

We’re developing an enterprise VPN client for macOS using NetworkExtension (PacketTunnelProvider) with Always-On / On-Demand VPN, deployed via MDM. On macOS 14.x and 15.x we observe the following log message from nesessionmanager: nesessionmanager: NESMVPNSession[...] Resetting VPN On Demand This most commonly occurs after sleep → wake. After this happens, the VPN no longer reconnects automatically, even though isOnDemandEnabled remains true and On-Demand rules are still present. Then a manual user action is required to reconnect. Questions: Is the “Resetting VPN On Demand” log message expected during sleep/wake transitions? Under what conditions does macOS reset On-Demand VPN state? Is there a supported way to detect or recover from this state programmatically? Any guidance on expected behavior or best practices would be appreciated.

Hi, I’m implementing a macOS DNS Proxy as a system extension and running into a persistent activation error: OSSystemExtensionErrorDomain error 9 (validationFailed) with the message: extension category returned error This happens both on an MDM‑managed Mac and on a completely clean Mac (no MDM, fresh install). Setup macOS: 15.x (clean machine, no MDM) Xcode: 16.x Team ID: AAAAAAA111 (test) Host app bundle ID: com.example.agent.NetShieldProxy DNS Proxy system extension bundle ID: com.example.agent.NetShieldProxy.dnsProxy The DNS Proxy is implemented as a NetworkExtension system extension, not an app extension. Host app entitlements From codesign -d --entitlements :- /Applications/NetShieldProxy.app: xml com.apple.application-identifier AAAAAAA111.com.example.agent.NetShieldProxy <key>com.apple.developer.system-extension.install</key> <true/> <key>com.apple.developer.team-identifier</key> <string>AAAAAAA111</string> <key>com.apple.security.app-sandbox</key> <true/> <key>com.apple.security.application-groups</key> <array> <string>group.com.example.NetShieldmac</string> </array> <key>com.apple.security.files.user-selected.read-only</key> <true/> xml com.apple.application-identifier AAAAAAA111.com.example.agent.NetShieldProxy.dnsProxy <key>com.apple.developer.networking.networkextension</key> <array> <string>dns-proxy-systemextension</string> </array> <key>com.apple.developer.team-identifier</key> <string>AAAAAAA111</string> <key>com.apple.security.application-groups</key> <array> <string>group.com.example.NetShieldmac</string> <string>group.example.NetShieldmac</string> <string>group.example.agent.enterprise.macos</string> <string>group.example.com.NetShieldmac</string> </array> DNS Proxy system extension Info.plist On the clean Mac, from: bash plutil -p "/Applications/NetShieldProxy.app/Contents/Library/SystemExtensions/com.example.agent.NetShieldProxy.dnsProxy.systemextension/Contents/Info.plist" I get: json { "CFBundleExecutable" => "com.example.agent.NetShieldProxy.dnsProxy", "CFBundleIdentifier" => "com.example.agent.NetShieldProxy.dnsProxy", "CFBundleName" => "com.example.agent.NetShieldProxy.dnsProxy", "CFBundlePackageType" => "SYSX", "CFBundleShortVersionString" => "1.0.1.8", "CFBundleSupportedPlatforms" => [ "MacOSX" ], "CFBundleVersion" => "0.1.1", "LSMinimumSystemVersion" => "13.5", "NSExtension" => { "NSExtensionPointIdentifier" => "com.apple.dns-proxy", "NSExtensionPrincipalClass" => "com_example_agent_NetShieldProxy_dnsProxy.DNSProxyProvider" }, "NSSystemExtensionUsageDescription" => "SYSTEM_EXTENSION_USAGE_DESCRIPTION" } The DNSProxyProvider class inherits from NEDNSProxyProvider and is built in the system extension target. Activation code In the host app, I use: swift import SystemExtensions final class SystemExtensionActivator: NSObject, OSSystemExtensionRequestDelegate { private let extensionIdentifier = "com.example.agent.NetShieldProxy.dnsProxy" func activate(completion: @escaping (Bool) -> Void) { let request = OSSystemExtensionRequest.activationRequest( forExtensionWithIdentifier: extensionIdentifier, queue: .main ) request.delegate = self OSSystemExtensionManager.shared.submitRequest(request) } func request(_ request: OSSystemExtensionRequest, didFailWithError error: Error) { let nsError = error as NSError print("Activation failed:", nsError) } func request(_ request: OSSystemExtensionRequest, didFinishWithResult result: OSSystemExtensionRequest.Result) { print("Result:", result.rawValue) } } Runtime behavior on a clean Mac (no MDM) config.plist is created under /Library/Application Support/NetShield (via a root shell script). A daemon runs, contacts our backend, and writes /Library/Application Support/NetShield/state.plist with a valid dnsToken and other fields. The app NetShieldProxy.app is installed via a notarized, stapled Developer ID .pkg. The extension bundle is present at: /Applications/NetShieldProxy.app/Contents/Library/SystemExtensions/com.example.agent.NetShieldProxy.dnsProxy.systemextension. When I press Activate DNS Proxy in the UI, I see in the unified log: text NetShieldProxy: [com.example.agent:SystemExtensionActivator] Requesting activation for system extension: com.example.agent.NetShieldProxy.dnsProxy NetShieldProxy: [com.example.agent:SystemExtensionActivator] SystemExtensionActivator - activation failed: extension category returned error (domain=OSSystemExtensionErrorDomain code=9) NetShieldProxy: [com.example.agent:SystemExtensionActivator] SystemExtensionActivator - OSSystemExtensionError code enum: 9 NetShieldProxy: [com.example.agent:SystemExtensionActivator] SystemExtensionActivator - validationFailed And: bash systemextensionsctl list -> 0 extension(s) There is no prompt in Privacy & Security on this clean Mac. Question Given: The extension is packaged as a system extension (CFBundlePackageType = SYSX) with NSExtensionPointIdentifier = "com.apple.dns-proxy". Host and extension share the same Team ID and Developer ID Application cert. Entitlements on the target machine match the provisioning profile and Apple’s docs for DNS Proxy system extensions (dns-proxy-systemextension). This is happening on a clean Mac with no MDM profiles at all. What are the likely reasons for OSSystemExtensionErrorDomain error 9 (validationFailed) with "extension category returned error" in this DNS Proxy system extension scenario? Is there any additional configuration required for DNS Proxy system extensions (beyond entitlements and Info.plist) that could trigger this category-level validation failure? Any guidance or examples of a working DNS Proxy system extension configuration (host entitlements + extension Info.plist + entitlements) would be greatly appreciated. Thanks!

When installing a new version the app while a tunnel is connected, seemingly the old packet tunnel process gets stopped but the new one does not come back up. Reportedly, a path monitor is reporting that the device has no connectivity. Is this the expected behavior? When installing an update from TestFlight or the App store, the packet tunnel instance from the old tunnel is stopped, but, due to the profile being on-demand and incldueAllNetworks, the path monitoring believes the device has no connectivity - so the new app is never downloaded. Is this the expected behavior? During development, the old packet tunnel gets stopped, the new app is installed, but the new packet tunnel is never started. To start it, the user has to toggle the VPN twice from the Settings app. The tunnel could be started from the VPN app too, if we chose to not take the path monitor into account, but then the user still needs to attempt to start the tunnel twice - it only works on the second try. As far as we can tell, the first time around, the packet tunnel never gets started, the app receives an update about NEVPNStatus being set to disconnecting yet NEVPNConnection does not throw. The behavior I was naively expecting was that the packet tunnel process would be stopped only when the new app is fully downloaded and when the update is installed, Are we doing something horribly wrong here?

Hi everyone 👋 As a network engineer and indie iOS developer, I couldn’t find a lightweight mobile tool that fully supports IPv4/IPv6 dual-stack diagnostics — so I built NetToolbox -All-In-One Utility for engineers, DevOps, and developers. Here are its core features that solve real mobile networking pain points: One-Click Full Diagnostics: Integrates ping, traceroute, and multi-type DNS queries (A/AAAA/CNAME) — no need to switch between apps IPv4/IPv6 Dual-Stack Support: Seamlessly works in IPv6-only networks, with the ability to test connectivity differences between dual-stack environments LAN Device Scanning: Quickly identifies all devices on the same network segment and checks port availability Offline Functionality: Diagnostic logic is stored locally, enabling LAN troubleshooting without an internet connection Lightweight Design: 5MB install size, no storage bloat, and low power consumption during operation Dark Mode Support: Tailored for developers who work late at night During development, I leveraged Apple Intelligence alongside Claude Code and Gemini 3 to accelerate the process, optimize iOS native networking stack adaptation and local storage logic, and significantly boost development efficiency. I’d love to hear from the community: What must-have features are missing from mobile network diagnostic tools? Do you have experience optimizing iOS workflows with Apple Intelligence? 👉 You can try the app here: https://apps.apple.com/us/app/nettoolbox-all-in-one-utility/id6757392404 Feedback is highly appreciated — I’ll keep iterating to make it better! 🚀

Apple supports Wi‑Fi Aware, but it’s not clear what channel bandwidth Apple’s Wi‑Fi Aware uses. Is it 80 MHz or 40 MHz? Also, what is the channel bandwidth used by AirDrop?

We've often observed connectivity issues from our VPN app that can only be remedied by removing the VPN profile. It happens to a small but significant amount of our users, this often happens more when the app is updated, but the VPN profile corruption can happen without that too. The behavior we're observing is that any socket opened by the packet tunnel process just fails to send any data whatsoever. Stopping and restarting the packet tunnel does not help. The only solution is to remove the profile and create a new one. We believe our app is not the only one suffering from this issue as other VPN apps have added a specific button to refresh their VPN profile, which seemingly deletes and re-created the VPN configuration profile. Previously, we've caught glimpses of this in a sysdiagnose, but that was a while ago and we found nothing of interest. Alas, the sysdiagnose was not captured on a device with the network extension diagnostic profile (it was not a developer device). I would love to get technical support with this, as our bug reports have gone unanswered for long enough, yet we are still struggling with this issue. But of course, there is no minimum viable xcodeproject that reproduces this. Is there anything we can feasibly do to help with this issue? Is it even an acknowledged issue?

https://developer.apple.com/documentation/NetworkExtension/filtering-network-traffic App example not auto reconnect after network extension crush. what need to add for auto reconnect when network extension restart?

I filed FB19631435 about this just now. Basically: starting with 15.6, we've had reports (internally and outternally) that after some period of time, networking fails so badly that it can't even acquire a DHCP lease, and the system needs to be rebooted to fix this. The systems in question all have at least 2 VPN applications installed; ours is a transparent proxy provider, and the affected system also had Crowdstrike's Falcon installed. A customer system reported seemingly identical failures on their systems; they don't have Crowdstrike, but they do have Cyberhaven's. Has anyone else seen somethng like this? Since it seems to involve three different networking extensions, I'm assuming it's due to an interaction between them, not a bug in any individual one. But what do I know? 😄

I haven’t been able to get this to work at any level! I’m running into multiple issues, any light shed on any of these would be nice: I can’t implement a bloom filter that produces the same output as can be found in the SimpleURLFilter sample project, after following the textual description of it that’s available in the documentation. No clue what my implementation is doing wrong, and because of the nature of hashing, there is no way to know. Specifically: The web is full of implementations of FNV-1a and MurmurHash3, and they all produce different hashes for the same input. Can we get the proper hashes for some sample strings, so we know which is the “correct” one? Similarly, different implementations use different encodings for the strings to hash. Which should we use here? The formulas for numberOfBits and numberOfHashes give Doubles and assign them to Ints. It seems we should do this conversing by rounding them, is this correct? Can we get a sample correct value for the combined hash, so we can verify our implementations against it? Or ignoring all of the above, can we have the actual code instead of a textual description of it? 😓 I managed to get Settings to register my first attempt at this extension in beta 1. Now, in beta 2, any other project (including the sample code) will redirect to Settings, show the Allow/Deny message box, I tap Allow, and then nothing happens. This must be a bug, right? Whenever I try to enable the only extension that Settings accepted (by setting its isEnabled to true), its status goes to .stopped and the error is, of course, .unknown. How do I debug this? While the extension is .stopped, ALL URL LOADS are blocked on the device. Is this to be expected? (shouldFailClosed is set to false) Is there any way to manually reload the bloom filter? My app ships blocklist updates with background push, so it would be wasteful to fetch the filter at a fixed interval. If so, can we opt out of the periodic fetch altogether? I initially believed the API to be near useless because I didn’t know of its “fuzzy matching” capabilities, which I’ve discovered by accident in a forum post. It’d be nice if those were documented somewhere! Thanks!!

I added a Content Filter to my app, and when running it in Xcode (Debug/Release), I get the expected permission prompt: "Would like to filter network content (Allow / Don't Allow)". However, when I install the app via TestFlight, this prompt doesn’t appear at all, and the feature doesn’t work. Is there a special configuration required for TestFlight? I already set the minimum deployment to be 17 for the extension and the app. Thanks!