Not sure if many people have come across the same problem as I did with BF2 if you wanted to play Coop games. Since the introduction of the Brilliant 1.3 Patch (not) there has been a facility to play Coop games with your friends against the Bots.....good fun.....you can adjust the level of play, good for a bit of TV practice etc. Anyway my point being that if you have been unable to connect to a user who has a Modem Router with NAT chances are you will be locked out. The NAT i believe acts as a Firewall. I tried turning off the Windows Firewall which i do every time I play as well as the NOD32 Anti virus, it wasn't until i read up on PORT FORWARDING that i found this site http://www.portforward.com/routers.htm from there select your game type and hey presto it god dam worked. So give it a crack, give them BOTS hell.

Cheers Dean