His router is blocking the ports needed for data transfer in Kaillera. That's the most likely answer anyway. The problem might be on your end, if you have a router as well. You (and/or your friend) need to open all ports for Kaillera to work, although I've heard that ports 1000-6000 may suffice. You know, you could have searched the board. I believe there has been similar topics in the past.