Captain, as the first step, please, check that router/software is not blocking ports 7770, 8089, 5672, 5222, 8080, 21020-21036, 7401-7600 for the game, also turn off all programs which use internet heavily (like torrent programs, netflix clients), disable antivirus, turn off k9 web protection filter or similar to that filters. Also, please try to set Compatibility with Windows 7 on the both client.exe and client_,exe files (here \SteamApps\common\Naval Action) and also update the GPU drivers in case they are outdated. There has been aslo mentioned this workaround that helped a couple of Captains: