I'm unable to host a multiplayer game on my Windows desktop, either Standard or Hotseat. My firewall allows both the DX and Mantle Beyond Earth, and I can host Civ 5 without this issue. I can click on Host Game in the lobby, but the Host Game button in the game setup screen doesn't work. In the Logs directory, net_connection_debug.log has this error with nothing after it: DBG: JoinRoomFailed: Failed to join lobby. Reason: 10 init_host.log has a lot of this with nothing after it: DBG: Multiplayer Init(Host) I verified the cache, deleted the User profile, and reinstalled it. None of those three fixed the issue. Google only shows one post that's related that wasn't answered. Has anyone else had this issue?