I also had this problem. I have a linksys WRT-54G V. 5. I updated the firmware (check the linksys website for help, it's very easy). I enabled UPnP and disabled NAT filtering. Every thing works fine now. The problems people are having are probably due to their own equipment. Equipment may be out of date, or restricted. Since I don't have the same hardware, I can only hope my troubleshooting helps you. Check your router first.
and how do u lower the firewall restriction? i am having the same problemo
Dont you guys know that iphones cant play online because the game doesnt support a 3G Connection at the moment? Check back at the next update that hopefully has a map.
just email activision at firstname.lastname@example.org and tell them about it and im sure they will give you refund real fast...
i heard they are giving out free maps to people with connection problems too.. just email them at same email asking about it.