Jellyfin issue with internal and external access

[XmonWoW]

Hi all,
I have a really simple deployment in my home that i could not get to work properly.
My jellyfin server is running on a Windows computer connected to the network wirelessly.
I have two more TVs connected wirelessley also.
I have the need to connect to the jellyfin also externally.
When im configuring port forwarding on my router (8096>8096) I suddenly lose connection to internally.
When I disable the port forwarding it works fine internally.
I tried also configuring port triggering (8097>8096) for external access, but still the same result.
As long as my port forwarding rule is configured, I can't access internally.
I couldn't find any log that gives me any idea on what the problem is, maybe you will have a clue.
Attached logs:
[2024-04-29 20:25:37.759 +03:00] [ERR] [70] Emby.Dlna.Main.DlnaEntryPoint: Error sending socket message from "10.100.102.101" to "239.255.255.250:1900"
System.Net.Sockets.SocketException (10049): The requested address is not valid in its context.
  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.Threading.Tasks.ValueTask`1.ValueTaskSourceAsTask.<>c.<.cctor>b__4_0(Object state)
--- End of stack trace from previous location ---
  at System.Threading.Tasks.TaskToApm.End[TResult](IAsyncResult asyncResult)
  at Emby.Server.Implementations.Net.UdpSocket.<>c__DisplayClass21_0.<SendToAsync>b__0(IAsyncResult callbackResult)
--- End of stack trace from previous location ---
  at Rssdp.Infrastructure.SsdpCommunicationsServer.SendFromSocket(ISocket socket, Byte[] messageData, IPEndPoint destination, CancellationToken cancellationToken)

The log says the IP of 10.100.102.101 altough I changed the server to 10.100.102.102 recently.
The problem was before the change of IP but somehow it still remembers the old IP.
Of course, when i try to connect via the TVs, the jellyfin application discovers the correct IP (10.100.102.102), even when i configure it manually and not via the discover option.
I tried uninstall and install once again but still the same.


Hope you can help me.

Thank you in advance.

[TheDreadPirate]

Is NAT loopback/hairpin enabled on your router?

[XmonWoW]

My router doesn't even have the option.
Only regular port forwarding.

[TheDreadPirate]

Check that remote connections are enabled in Jellyfin. Dashboard > Networking.

Did you tell Jellyfin to bind to a particular address?

[XmonWoW]

Yes, remote connections are enabled.
when i configure the port forwarding, extrnally works fine.
just not internally and externally together.
I saw the Bind to local address option, but I didn't understand what does it mean.

[TheDreadPirate]

This has to be a quirk with your router. Jellyfin or Linux or Windows wouldn't cause this.