My best friend who just moved from Fredericton (where I am) to Surrey, with whom I used to play COD4 almost every day, is now no longer able to connect to me, nor I to him. We both have great internet connections, both of our NAT types are open...but we can join each other's parties, games, or private chats. the only way we can play together is if we both join someone else's party. We just can't connect directly to each other, which is a SERIOUS fucking pain in the ass. Could someone explain why this is happening and tell me how to remedy the situation? Because I really don't understand it at all.