I haven't played online for years, I'm now trying to join a server (as a test) but it doesn't show any (error). I opened up my TCP and UDP ports on 10052 to 10054 and I'm running Jazz2 + (latest version) on Jazz 1.23. (Jazz+ Beta v5.1 24-8-2015)

And when hosting:

[17:48:10] >> Server has been disconnected from the list server
[17:48:10] >> Attempting to automatically list server
[17:48:30] >> Server failed to list

I can't figure this out, maybe you have any ideas?