Wow, this is my first ban in all my gamer life experience, since my first 33.6Kbaud online multiplayer game. And guess the reason? Cause I rebought UT2004 from GoG and my CD-KEY is banned cause warez...

Thank you GoG and CD-Project!

I think all UT games comes with a prebaked CD-key for ease of use.
The negative thing is that if one player gets banned with this key, then the rest of us can't join a server with that key.

GOG handed out personal CD-keys while the game was sold if one asked for it.
Check with support if you still can get a personal CD-key.