: Background adapters like VirtualBox can block the game's view of real LAN servers. Go to "Change adapter settings" in Windows and disable any "VirtualBox Host-Only" networks. Port Forwarding : Ensure ports are open on the host machine's firewall. Direct IP Connect
If you have an internet connection just once to set things up, this is the safest route. how to play serious sam 3 multiplayer lan without steam hot
For a completely Steam-free setup:
Playing without Steam can sometimes trigger the game's anti-piracy measures (DRM), such as the "spinning camera" or "invincible scorpions". : Background adapters like VirtualBox can block the