Not sure what the problem is. The firewall is the usual suspect, but if you have it disabled??? Sometimes I have not been able to find the session I selected. Not sure how often the list of active sessions is refreshed, but the game you were trying to join may have ended even though it was still on the list. Try getting someone to host a session and give you their IP address. See if you can join that way. If you will post here or send me a PM I will host a game so you can try. I should be available after 6pm Central time.

Eric