» Tue Oct 21, 2008 10:57 pm
Your network might be the problem? I'm not sure if your NAT has much to do with it, I don't know much about that stuff. All I can think of is your network.
I was reading in another thread that the game won't let you touch multiplayer if you're under 18 on your XBOX profile. Could this be the issue? Does it give you a notification?