I am going to try and explain everything in fullest detail as possible, so i can get this fixed. Alright i have 2 particular friends i cant join games or parties with, (inless there is someone else in the party, if that person leaves, we disconnect from each other) I have done connection tests, doesnt show an error, black ops says i have an open nat, both of those friends have done connection tests and everything is working, they have an open nat, we live close together, all within 10 miles of each other, same internet provider. My setup is a modem ( speedtouch st546 v6, made by thomson) then its hooked up to our router (netgear wndr4000) I also have a linksys wrt54g we had before we upgraded and even when using that one i cant connect to those 2 friends. Funny thing is i used to beable to connect to them a few months ago. A while back our old speedtouch 516, thomson fried, we upgraded to the one above, but even when we upgraded it worked. I have no clue what is going on! there is so many answers and i want to game a lot this summer with those friends. Please help, very desperate!