Bug: SyncService erroring

[pierrelasse]

Reproduction steps

1. Open Sync tab

Actual result

1. Open Sync tab
2. See "Not connected to relay, remote connections will work" and errors in console

Expected result

1. Connecting to the relay idk

Grayjay Version

12

Which OS version are you using?

Linux 6.18.1-arch1-2

Are you using flatpak?

• Check this if you installed flatpak version for Linux. If unsure, leave blank.

Are you using a VPN?

Tested with and without

Other info

Lmk if more info is needed.
ping relay.grayjay.app and telnet relay.grayjay.app 9000 work.
curl inside flatpak sandbox:

sh-5.2$ curl -v relay.grayjay.app:9000
* Host relay.grayjay.app:9000 was resolved.
* IPv6: 2a01:4ff:f0:3ffc::1
* IPv4: 178.156.173.80
*   Trying [2a01:4ff:f0:3ffc::1]:9000...
* Connected to relay.grayjay.app (2a01:4ff:f0:3ffc::1) port 9000
* using HTTP/1.x
> GET / HTTP/1.1
> Host: relay.grayjay.app:9000
> User-Agent: curl/8.15.0
> Accept: */*
>
* Request completely sent off
* Received HTTP/0.9 when not allowed
* closing connection #0
curl: (1) Received HTTP/0.9 when not allowed

Relevant log output

[2025-12-19 11:43:27.470] [ERROR] [SyncService] Relay session failed.
Exception: The operation was canceled.
Stack Trace:    at System.Threading.CancellationToken.ThrowOperationCanceledException()
at System.Threading.CancellationToken.ThrowIfCancellationRequested()
at System.Net.Sockets.Socket.<ConnectAsync>g__WaitForConnectWithCancellation|285_0(AwaitableSocketAsyncEventArgs saea, ValueTask connectTask, CancellationToken cancellationToken)
at SyncShared.Utilities.ConnectToAddressAsync(IPAddress address, Int32 port, CancellationToken token) in /run/build/grayjay/SyncServer/SyncShared/Utilities.cs:line 177
at SyncShared.Utilities.OpenTcpSocketAsync(String host, Int32 port, CancellationToken cancellationToken) in /run/build/grayjay/SyncServer/SyncShared/Utilities.cs:line 143
at SyncClient.SyncService.<StartRelayLoop>b__47_0() in /run/build/grayjay/SyncServer/SyncClient/SyncService.cs:line 224
[2025-12-19 11:43:47.601] [ERROR] [SyncService] Relay session failed.
Exception: The operation was canceled.
Stack Trace:    at System.Threading.CancellationToken.ThrowOperationCanceledException()
at System.Threading.CancellationToken.ThrowIfCancellationRequested()
at System.Net.Sockets.Socket.<ConnectAsync>g__WaitForConnectWithCancellation|285_0(AwaitableSocketAsyncEventArgs saea, ValueTask connectTask, CancellationToken cancellationToken)
at SyncShared.Utilities.ConnectToAddressAsync(IPAddress address, Int32 port, CancellationToken token) in /run/build/grayjay/SyncServer/SyncShared/Utilities.cs:line 177
at SyncShared.Utilities.OpenTcpSocketAsync(String host, Int32 port, CancellationToken cancellationToken) in /run/build/grayjay/SyncServer/SyncShared/Utilities.cs:line 143
at SyncClient.SyncService.<StartRelayLoop>b__47_0() in /run/build/grayjay/SyncServer/SyncClient/SyncService.cs:line 224
[2025-12-19 11:43:50.685] [ERROR] [T] An exception occurred in the IPC
Exception: The operation was canceled.
Stack Trace:    at System.Threading.CancellationToken.ThrowOperationCanceledException()
at System.Net.Sockets.Socket.AwaitableSocketAsyncEventArgs.ThrowException(SocketError error, CancellationToken cancellationToken)
at System.Net.Sockets.Socket.AwaitableSocketAsyncEventArgs.System.Threading.Tasks.Sources.IValueTaskSource<System.Int32>.GetResult(Int16 token)
at System.IO.Pipes.PipeStream.ReadAsyncCore(Memory`1 destination, CancellationToken cancellationToken)
at System.IO.Stream.ReadAtLeastAsyncCore(Memory`1 buffer, Int32 minimumBytes, Boolean throwOnEndOfStream, CancellationToken cancellationToken)
at System.Runtime.CompilerServices.PoolingAsyncValueTaskMethodBuilder`1.StateMachineBox`1.System.Threading.Tasks.Sources.IValueTaskSource.GetResult(Int16 token)
at DotCef.DotCefProcess.<Start>b__28_3()
[2025-12-19 11:43:50.687] [ERROR] [SyncService] Unhandled exception in StartRelayLoop.
Exception: A task was canceled.
Stack Trace:    at SyncClient.SyncService.<StartRelayLoop>b__47_0() in /run/build/grayjay/SyncServer/SyncClient/SyncService.cs:line 358
Log flusher exited with exception: System.Threading.Tasks.TaskCanceledException: A task was canceled.
at Grayjay.Desktop.POC.Log.<.ctor>b__7_0()
[2025-12-19 11:43:50.689] [ERROR] [SyncService] Server socket had an unexpected error.
Exception: Operation canceled
Stack Trace:    at System.Net.Sockets.Socket.AwaitableSocketAsyncEventArgs.ThrowException(SocketError error, CancellationToken cancellationToken)
at System.Net.Sockets.Socket.AwaitableSocketAsyncEventArgs.System.Threading.Tasks.Sources.IValueTaskSource<System.Net.Sockets.Socket>.GetResult(Int16 token)
at System.Threading.Tasks.ValueTask`1.ValueTaskSourceAsTask.<>c.<.cctor>b__4_0(Object state)
--- End of stack trace from previous location ---
at SyncClient.SyncService.<StartListener>b__42_0() in /run/build/grayjay/SyncServer/SyncClient/SyncService.cs:line 146

[Zvonimir-FUTO]

Could you set logs to Debug level and restart the app, then reproduce the issue and upload log.txt file?

[pierrelasse]

Sure I can do that later. Where will I find the log file?

[Zvonimir-FUTO]

Sure I can do that later. Where will I find the log file?

~/.var/app/app.grayjay.Grayjay/data/Grayjay/log.txt

[pierrelasse]

log.txt (with minor changes). Lmk if you need more info.

[Zvonimir-FUTO]

Seems like you are timing out often and that's the reason for failure. Did you notice other timeout issues elsewhere while using your computer?

[pierrelasse]

Did you notice other timeout issues elsewhere while using your computer?

Perhaps, but not this bad I think. Do you have an idea how I could narrow it down to that? Using a command etc.

[bwrinkle1]

A past update introduced a similar issue, probably not the same cause though? #728

A work-around for me is to start the sync from the desktop app, then use the "Show Pairing Code" from the mobile app, then enter that code into the desktop app, giving permission to sync on the mobile app.

I haven't tried other methods, but scanning the desktop app's QR code caused the handshaking to never complete, whereas this method worked for me after one try.