Well seeing how he can log into the game and the others can't I think its safe to say its not the oem's because the client download would have the same oems as his client seeing he would be the one to make the upload. His best bet is his ports. well in my opinion at least. It being a hamachi problem might be ruled out to because if the ips were not right in the client anyways the acc msg and npc shouldnt all start.