- Have you tried the latest test patch?
- Have you tried a single player game?
- Have you tried to create your own server on your LAN and then connect?
- Do you have problems with other online games?
- Is your network card OK.
- You have the latest drivers for network card etc.?
And did you report this incident before? If you dont provide more details ther is no way this problem is gonna get solved. Saying that it doesnt work and not giving info so the devs can even get a clue of what is going on, is a hopeless situation.