3 different Steam accts, 2 can host, 1 can't?
Two PCs are Windows 7sp1, one is Win8.1.
Ports 6000 & 6112 are open on all three PCs (both TCP & UDP). Confirmed via nmap 6.40.
UPnP and SSDP services are set to Automatic and Started. UPnP and HTTP ports are open in the firewalls.
Either of the two Windows 7sp1 machines can host and the other two PCs can join the game.
If I host a game on the Windows 8.1 machine, the two Windows 7sp1 PCs see the game in list of available games to join. but when they click to join, nothing happens for 15-30 seconds and then a window pops up stating they have "Disconnected from the server".
Any thoughts or suggestions as to what else I can look at/test?