General: DevForums subtopic: App & System Services > Core OS Core OS is a catch-all subtopic for low-level APIs that don’t fall into one of these more specific areas: Processes & Concurrency Resources Files and Storage Resources Networking Resources Network Extension Resources Security Resources Virtualization Resources Share and Enjoy — Quinn “The Eskimo!” @ Developer Technical Support @ Apple let myEmail = "eskimo" + "1" + "@" + "apple.com"

Is there any restriction in File system renaming using shove from sandboxed to runtime path?? failed _relinkFile(/Library/InstallerSandboxes/.PKInstallSandboxManager/EFFC026D-F5AD-4F2D-8EB1-E73B78E51E1A.activeSandbox/Root/Library/Application Support/McAfee/MSS/Applications/Trellix Agent Status Monitor.app/Contents/_CodeSignature/CodeResources, /Library/Application Support/McAfee/MSS/Applications/Trellix Agent Status Monitor.app/Contents/_CodeSignature/CodeResources): Operation not permitted 2026-05-27 12:20:37-04 OSX-CG46R0630R installd[8236]: PackageKit: releasing backupd 2026-05-27 12:20:37-04 OSX-CG46R0630R installd[8236]: PackageKit: allow user idle system sleep 2026-05-27 12:20:37-04 OSX-CG46R0630R installd[8236]: PackageKit: Install Failed: Error Domain=PKInstallErrorDomain Code=120 "An unexpected error occurred while moving files to the final destination." UserInfo={NSLocalizedDescription=An unexpected error occurred while moving files to the final destination., This is immediately followed by: PKInstallErrorDomain Code=120 NSPOSIXErrorDomain Code=1 "Operation not permitted" Based on the installer logs reviewed so far, the failure appears to occur during a PackageKit file relink operation and is accompanied by "Operation not permitted" errors, which suggests a permissions enforcement issue during installation.

I’m building a sandboxed macOS App Store app that registers an agent using SMAppService. I’m trying to understand the IPC setup between the main app and the SMAppService-managed agent. The obvious options seem to be: XPC with a Mach service But from what I understand, I’d need a special entitlement that allows me to communicate over XPC Mach service - which is unlikely to pass Mac App Store review. So how do people communicate with processes registered with SMAppService?

Hello, I have a device like a gas meter or an electricity meter and it has: an optical interface IEC 62056-21 (IEC-1107) with support for speeds up to 115,200 Bd. On Windows and Android, we use a cable that has an optical interface and on the other end we connect USB A to the PC and to the Android via an OTG to USB adapter. The cable contains a chip from FTDI FT230XQ. I have an application in MAUI where I want to connect this cable to the 10th generation iPad and communicate similarly to, for example, via the COM5 port on the PC. When the port opens, I send a query and get a response. Is it possible, what should I do for this? What about Apple certification of cables? Is it possible to send a packet from MAUI via the USB C port via the cable and then receive and process the packet again? What about MFi? I found this: https://redpark.com/usb-c-serial-cable/ Please can you give me some idea or expert to this topic? Thanks, Roman

Retrained Siri multiple times, turned off and on, hard reboots, cannot clear the badge on Settings icon asking to reset Siri. Siri working, new Siri on waitlist. How to clear? IOS 27 beta 1, iPhone 17 Pro.

Hi! I'm developing an FSKit module and experiencing some troubles with test harness automation: Registering an FSKit AppEx requires user intervention by clicking through a GUI. Re-deploying a new build signed with a local certificate involves the same roundabout to re-toggle the registered AppEx in the Settings. Are there any plans to improve developer experience in this regard?

Very frustrated. Cannot get iOS 27 to function. I am missing the "Apple Intelligence & Siri" settings item. It just says "Siri". I've scoured forums and the wider internet with no solution. I've done 2 clean installs, first with restore from iCloud. Then without. I've tried every recommendation on settings to do with Siri, ScreenTime, Region, VPN, Language, Voice, etc. I've checked my phone's serial number to make sure it's not one intended for the China market (it's not), and spent many hours trying to fix this. Finally I got something that said: Your primary Apple Account's background tokens are corrupted on Apple's servers and must be escalated to Apple Engineering. So this is not a problem I can fix myself. My understanding is this is the only way to make contact with Apple engineering and I hope someone sees this and can do whatever needs to be done to fix it on the server side... which I hope will translate to it being fixed on the client side. Please help. Thank you.

I'm trying to install Mac OS 27 on my Mac Book Pro m1 pro and I'm getting this error: I have tried from the terminal, clearing the cache, and I've tried a couple of different days and the issue still occurs. Internet connection if fine, no VPNs and nothing that should block it.

We are seeing a reproducible scenario on iOS 26 where incoming VoIP push notifications are never delivered when the device has been idle and screen-locked for 30+ minutes. The same failure was observed simultaneously on WhatsApp, and Microsoft Teams and our app as well, on the same device during one incident, confirming this is a platform-level issue and not specific to our implementation. We have captured full system logs across three separate incidents. Below are the exact log sequences. Incident — All VoIP apps fail simultaneously (Our app, WhatsApp, Teams) Device: iPhone 17 Pro · iOS: 18.x · Network: 5G NSA (kNRNSA) The device had been idle with the screen locked for approximately 31 minutes. An LTE cell handover caused apsd to begin an APNs reconnection. powerd entered policy 3 before apsd reached channel-flow viable, defuncting the app. 17:45:59.562 symptomsd New RRC 0 when previous 1 from pdp_ip0 ↑ Radio drops to RRC_Idle. Device has been idle since 17:14:56 (31 min). 17:46:01.206 CommCenter #I Mapping the registration state to kRegisteredHome ↑ LTE cell handover triggers RRC reconnect. 17:46:01.330 apsd [C138 IPv4#b71cac13:5223 ready parent-flow (satisfied (Path is satisfied), interface: pdp_ip0[lte], scoped, ipv4, ipv6, dns, expensive, uses cell, LQM: good)] event: path:satisfied_change @594.391s ↑ APNs path re-satisfied. Reconnection begins. channel-flow viable NOT yet reached — TLS handshake still in progress. 17:48:08.057 apsd Powerd has requested assertion activity update ↑ Warning: powerd about to change policy. ── 2 minutes 40 seconds after APNs reconnect started ── 17:48:41.248 powerd Sending com.apple.powerd.assertionpolicy 3 17:48:41.250 apsd Update assertion policy 3 17:48:41.250 powerd Activity changes from 0x1 to 0x0. UseActiveState:0 17:48:41.250 powerd hidActive:0 displayOff:1 assertionActivityValid:0 ↑ Screen off, device locked. OS enters restricted idle. apsd restricted. APNs reconnection abandoned. 17:48:42.669 kernel necp_process_defunct_list: necp_update_client abort nexus error (2) for pid 1518 Comera ↑ Kernel terminates Comera's network stack via NECP. No API available to prevent this. WhatsApp and Teams remain suspended — no DEFUNCT, but apsd in policy 3 means no push delivery for them either. ── Dead zone: VoIP pushes for all 3 apps undeliverable ── 17:50:04.028 powerd Process CommCenter.104 Created SystemIsActive "com.apple.ipTelephony.sipIncoming.cell" ↑ Incoming cellular PSTN call forces system wake. 17:50:04.494 powerd Sending com.apple.powerd.assertionpolicy 0 17:50:04.598 apsd Update assertion policy 0 ↑ Full wake. Queued VoIP pushes from Comera, WhatsApp, and Teams are delivered simultaneously. Gap between channel-flow viable needed and actual delivery: 4 minutes 3 seconds. Recovery trigger: external cellular call from carrier — not any app action. Working case (same test, different conditions) Device: iPhone 17 Pro · iOS: 26.5.1 · Screen unlocked, no hotspot 19:2x:xx apsd policy state {downgradeWhenLocked: NO, isSystemLocked: NO, isConnectedOnUltraConstrainedInterface: NO} ↑ Device unlocked. No policy 3. Comera NOT defuncted. Push delivered. Call rings normally. Our implementation PKPushRegistry is held strongly and re-registered on every applicationWillEnterForeground reportNewIncomingCall(with:update:completion:) is called synchronously within pushRegistry(_:didReceiveIncomingPushWith:) VoIP background mode entitlement is present App has com.apple.developer.pushkit.voip entitlement Questions Is there any entitlement or API to prevent NECP from defuncting a process holding an active PKPushRegistry? The VoIP push entitlement exists for exactly this background delivery scenario. Is pushDisallowed being applied to apps with VoIP push entitlements when InternetSharingActive == 1 intentional? Should VoIP entitlements exempt an app from the Internet Sharing Policy gate in dasd? Is there a documented way to know when apsd has fully completed APNs reconnection (i.e. channel-flow viable) so a server can time push retries more accurately within a call validity window? What is the recommended apns-expiration value for VoIP pushes to survive brief APNs reconnection windows without exceeding a 60-second call validity period? Full log stream captures available for all incidents.

There are two beta restore files for A16, both are for ipad15,8. Please post one for ipad15,7

Environment macOS Tahoe 26.2 (Build 25C56) Also tested with macOS 26.3 Developer Beta - same issue Windows Server 2022 DFS namespace Connection via Tailscale VPN (but also tested with direct network connection) Problem Description When connecting to a Windows Server 2022 DFS namespace from macOS Tahoe, the root namespace connects successfully, but all subfolders appear empty and return either: "No route to host" "Authentication error" (alternates inconsistently) Steps to Reproduce Set up a Windows Server 2022 DFS namespace (e.g., \\domain.com\fs) Add DFS folder targets pointing to file servers (e.g., \\fs02\share, \\fs03\share) From macOS Tahoe, connect via Finder: smb://domain.com/fs Root namespace mounts successfully Issue: Subfolders show as empty or return "No route to host" when accessed What Works Direct SMB connections to individual file servers work perfectly: smb://10.118.0.26/sharename ✓ smb://fs02.domain.com/sharename ✓ Same DFS namespace works from Windows clients Same DFS namespace worked from macOS Sonoma 14.4+ What Doesn't Work DFS referrals from macOS Tahoe 26.x to any DFS folder target The issue persists regardless of: Kerberos vs NTLM authentication SMB signing enabled/disabled on servers Various /etc/nsmb.conf configurations DNS resolution (tested with IPs and FQDNs) Historical Context A similar DFS referral bug existed in macOS Sonoma 14.0 and was fixed in 14.1. This appears to be a regression in macOS Tahoe 26. Request Please investigate the DFS referral handling in macOS Tahoe. The fact that direct SMB connections work while DFS referrals fail suggests an issue specifically in the DFS referral processing code. Feedback Assistant report will be filed separately.

Ever since I updated my Mac mini M4 to macOS 27 (Golden Gate), the Applications icon in my Dock has stopped working completely. Clicking it does nothing. Is this a known bug, or is there something wrong with my system? Has anyone else experienced the same issue after updating? If there's a fix or workaround, I'd really appreciate the help. Thanks!

I have finished a new app that integrates Apple hosted background asset. I have tested and confirm that the assets are downloaded both locally and with a TestFlight build. App review is not able to access the background assets. I can see that the assets are updated with status "accepted". But app review is running into error "A server with the specified hostname could not be found.". These are Apple Hosted Assets. Did I miss any configuration?

Trying to virtualize macOS 27 on a 26.6 host failed at 77% install progress, even with Xcode 27 beta installed. But worked fine on a macOS 27 host. Are there any tricks to use a 26 host? Thanks!

Hi, Is there way to connect the host usb devices directly to guest vms using mac os Virtualization framework? Thanks

While testing the watchOS 27 beta, I noticed that the standalone Walkie-Talkie app has been removed from the system. Walkie-Talkie has always been a great, lightweight way to stay connected. Much like Digital Touch, it’s one of those quick, low-friction features that makes the watch feel uniquely personal for communication throughout the day. I am really hoping its absence is just a temporary beta omission rather than a permanent retirement of the feature. I have already submitted a request via Feedback Assistant asking the engineering team to consider keeping it in the final release. If you also rely on this app for quick wrist-to-wrist updates, I highly recommend submitting your own feedback ticket to let the team know there is still an active user base for it. (FB23040695) Has anyone else ran into this or found an official note from Apple regarding its removal in the release notes? Hopefully, we will see it return before the public release this fall. Over and out!

I have the following code for port forwarding in mac os virtualization var ipAddr = in_addr() // 1. Convert String to in_addr inet_pton(AF_INET, guestIP, &ipAddr) let status = vmnet_network_configuration_add_port_forwarding_rule( config, UInt8(IPPROTO_TCP), // TCP protocol sa_family_t(AF_INET), // address family guestPort, // internal port (guest) externalPort, // external port (host) &ipAddr // internal address (guest IP) ) if status == .VMNET_SUCCESS { print("✅ Port Forwarding set: Mac:\(externalPort) -> VM(\(guestIP)):\(guestPort)") } else { print("❌ Port Forwarding failed for \(guestIP): \(status.rawValue)") } It is returning success but when i test it it does not work. Is there anything i am doing wrong? Please help me also in fixing this problem. Note: The app runs in sandbox i tried without sandboxing and it does not work either. Please refer to this link https://developer.apple.com/forums/thread/822025?login=true&page=1#884236022 how i am creating the VZVmnetNetworkDeviceAttachment

Hi, I am very excited for the fskit changes. Now I finally had some time to actually read the docs. But I am not very sure how the new cache api is able to propagate external file tree changes to fskit. As far as I understand it only handels cached file data but not metadata? I really hope I am just misunderstanding and this is possible. Greetings Nils

Every time I use my iPhone 17 Pro. The device gets very warm. I have to turn it off cool it down and then use it again. Please fix this bug?

When I copy and paste something from one app to another app and it comes off of the clipboard. The text gets cut off. I have to manually cut and paste one line at a time otherwise the whole text will not show. When other people post something and I read whatever the person‘s post is. That text gets cut off as well. Please fix this problem.

When I opened an Intel-based app in the macOS 27 beta, a prompt informed me that apps requiring Rosetta will not work in the next OS release (macOS 28). It also prompted me to install Rosetta to continue using the app in macOS 27. After installing, I began wondering if there is a way to remove Rosetta via Settings. Since it is now treated as an optional feature, shouldn't we be able to uninstall it similar to how command line tools are managed? Does anyone know of a method to completely remove Rosetta once it has been installed? (PS: This post was rewritten using Siri AI)