Chromecast app can't connect to server

[ras2000]

I was watching a show, and it stops suddenly, saying player error, retrying. It stops retrying. I went back to the main screen, and nothing works. I force stop of the app, clear cache, and try again. Now I get the User and Server page, to login. I do so, it says unable to connect to server.
Now I can only get the server and user, nothing happens if I click either. So I enter server address, same as on my pc. It's unable to connect, the address is correct.
This is from the log at the time, just the error
[2025-05-06 22:48:28.272 +01:00] [ERR] [81] Jellyfin.Networking.AutoDiscoveryHost: Error sending response message
System.Net.Sockets.SocketException (10051): A socket operation was attempted to an unreachable network.
  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 Jellyfin.Networking.AutoDiscoveryHost.RespondToV2Message(IPEndPoint endpoint, UdpClient broadCastUdpClient, CancellationToken cancellationToken)

Server version 10.10.7
App version 0.18.8
Running server on windows 11
Chromecast

What went wrong in the middle of watching a show?