Arkanok

Many greetings. I'll start off by saying that I love this game. However, I have a problem. My friend and I both have Sins of a Solar Empire, and we've played two games on Ironclad Online just fine. We were both using Windows Vista and after some router and firewall tweaking we were able to join each other's games and play. However, my friend recently installed it on his Windows XP Home Edition desktop. He tried to host a game but I couldn't join and got the error "Disconnected from game serve