Crash when attempting to debug on remote iOS device

[josephcassano]

Description

I am running Visual Studio 2026 18.4.2, Xcode 26.2, and attempting to debug on an iPhone running 26.4. The iPhone is connected to a Mac running Tahoe 26.3.1. I am able to successfully pair the mac in Visual Studio. I am also able to launch the application without debugging and it deploys to the phone without issue. I receive the following debug output log when attempting to debug.

Launching 'MauiApp2' on 'iPhone'...
INFO: [iOS Debugger] Connecting to "iPhone" over USB on port 10000...
INFO: Creating command connection...
INFO: Starting debugger connection to the app 'MauiApp2'. Debugger port: 50134, Device port: 10000
INFO: Connecting to remote debugger on port 50134...
INFO: Connecting to debug stream from device...
INFO: Connecting to debug stream from remote debugger...
INFO: [iOS Debugger] Connecting to "iPhone" over USB on port 10000...
INFO: [iOS HotReload] Connecting to "iPhone" over USB on port 11000...
INFO: [iOS Debugger] Connecting to "iPhone" over USB on port 10000...
INFO: Connecting to debug console stream...
INFO: Debugger connection signal received
INFO: Debugger connection completed
INFO: [iOS Debugger] Connected to "iPhone" over USB on port 10000.
INFO: [iOS Debugger] Connected to "iPhone" over USB on port 10000.
INFO: [iOS Debugger] Connected to "iPhone" over USB on port 10000.
The vsdbg debug session for project XXX has been stopped
The program 'MauiApp2' has exited with code 0 (0x0).
Failed to Stop app: An error occurred on client IDB18337 while executing a reply for topic xvs/idb/stop-app
The app has been terminated.
INFO: The debug stream is no longer available for writing
INFO: Closing debug connection from device (USB)
INFO: Disposing input and output streams...
INFO: The debug streams are no longer available for reading or writing
INFO: Closing debug connection from remote debugger (TCP)
INFO: Disposing input and output streams...

The ios logs are not helpful and simply state the app was terminated because it took longer than 20 seconds to run.

Things I have tried:

1. Temporarily disabled the firewall on the mac
2. Turned off Hot Reload
3. Removed and retrusted iphone
4. Attempted to wirelessly debug (option was not available)
5. Attempted to update Xcode to version 26.4

There seems to be a problem communicating with the ports on the iOS device.

Steps to Reproduce

1. Create a new MAUI application using Visual Studio 2026 18.4.2,
2. Pair with a Mac running Xcode 26.2 and MacOS Tahoe 26.3.1.
3. Connect an iPhone running 26.4 to the Mac
4. Attempt to run and debug the application on the iPhone.

Link to public reproduction project repository

No response

Version with bug

10.0.50

Is this a regression from previous behavior?

Not sure, did not test other versions

Last version that worked well

Unknown/Other

Affected platforms

iOS

Affected platform versions

No response

Did you find any workaround?

No response

Relevant log output

[dotnet-policy-service]

Thanks for the issue report @@josephcassano! This issue appears to be a problem with Visual Studio (Code), so we ask that you use the VS feedback tool to report the issue. That way it will get to the routed to the team that owns this experience in VS (Code).

If you encounter a problem with Visual Studio or the .NET MAUI VS Code Extension, we want to know about it so that we can diagnose and fix it. By using the Report a Problem tool, you can collect detailed information about the problem, and send it to Microsoft with just a few button clicks.

1. Go to the Visual Studio for Windows feedback tool or .NET MAUI VS Code Extension repository to report the issue
2. Close this bug, and consider adding a link to the VS Feedback issue so that others can follow its activity there.

[josephcassano]

Closing the issue. The Visual Studio Team has stated there is no way to debug when attempting to deploy to a device running a higher version of iOS than the SDK that the app was built on. The application will run on the device but will not allow debugging. Upgrading to XCode to 26.4 is not an option at this time as I originally attempted because the .NET iOS toolchain does not yet support that version.