Walter Hawkwood
RI Curator
My son and I have tried everything (we can think of) and we have been unable to play multiplayer without the OOS, it's a real pity too as this would be quite enjoyable multiplayer, awesome actually.
I got a system setup here as a server with an old i7 3770 cpu, 16GB and a 240SSD that we use as a server for a few different games, 7 days to die, Killing floor 2, Empyrion, and Pitboss for Civ 4.
I've installed the game in the C: directory, set permissions to "everyone", turned off firewalls and antivirus, deleted the cache, disabled random events, set the game to turn based rather than simultaneous turns, tried smaller maps and less civs and still no joy.
It really is strange, the pitboss server keeps running, if we both log out after the desync we can login again, have our turn, and then the very next turn we get another desync.
A couple of posts ago I told you the exact things to try: turning off some/all of "Religion Shock", "Barbarian Civs", "Revolutions" custom settings. Have you tried that?