Hi Mister Frag,
I have a working network connection (I can play other games online without problems)
I use Blackice Defender as a firewall (set to low) and I also tried with blackice off , but always with the same result.
I don't have Internet connection share (I think :-P) , at least I don't remember installing it.....
I ran DXDIAG and tested the TCP/IP and I could chat on the little chat window and I got reactions as well , so I got connected.
Any other ideas?