For all of you steam users, I recently came across a great post over at the steam forums, and I decided to share it with you all. Heres the link: http://forums.steampowered.com/forum....php?t=1952458...

mabey your port (7777 by default) is closed. try going into your firewall and opening it. you can also check to see if it is open with a program called PFPortChecker. ****** it.