First, before anything else, I must stress that this isn't a NAT problem. So please nobody even suggest that as both my friend and I have open NATs. So this all started about a year ago when me and my friend, for some unexplainable reason, were unable to join each others party. We always needed someone to be the middle-man in order to be in a party, and could never play games together. Then suddenly around April, we were able to make parties with each other and play games. So for some unexplainable reason we could play together again. Now, as of the end of September, we suddenly are unable to play games together again. Nothing has changed; we have the same console, same internet, and we live in the same location as before. Only difference is that we cannot play together or join each others party again. Is there any actual reason for this? Is the current Xbox Live service alert possibly causing this? I have no idea, and since nobody seems to know how to say anything other than NAT, I would like to here a better solution.