Thin client can't connect to server on a specific computer

[v4vendetta75005]

Hello,
I'm at my wits end on an issue I've encountered since yesterday.
Server : binhex/delugevpn docker (latest) on an ubuntu 24.04 host ==> server version is 2.2.0
Thin clients :

• Trireme on Android ==> connects to the server on local lan (192.168.1.0/24) and over internet

• Deluge thin client (v2.1.1) on computer 1 (windows 11 25H2) ==> connects to the server on local lan (192.168.1.0/24) and over internet

• Deluge thin client (v2.2.0) on computer 2 (ubuntu 24.04) ==> connects to the server on local lan (192.168.1.0/24) and over internet

• Deluge thin client (v2.1.1 and v2.2.0 tested) on computer 3 (windows 11 25H2) ==> can't connect to the server, either on local lan (192.168.1.0/24) or over internet but can connect through Web UI on 192.168.1.XXX:8112

When I fill in host/credentials in the connection manager on computer 3 and double click on the connection, I get a 10013 error message "An attempt was made to access a socket in a way forbidden by its access permissions".

If every thin client had the same error I would be looking on the server side but it's only one and the other windows computer, on the same network with the same windows and thin client version has no issue.

Has anyone ever encountered this issue ? I'd love not to have to reinstall my main computer to totally debug...