http://bugs.winehq.org/show_bug.cgi?id=35831
--- Comment #2 from roi1979 roi@torkilsheyggi.fo --- (In reply to Bruno Jesus from comment #1)
Did you test different combinations of 4 computers to be sure it's not network/firewall related?
Yes. All can host, all can join, none can join as third in queue. Tested on all four machines (hosting, join-as-second, join-as-third).