: The host starts the server using the -nosteam method mentioned above.
If your Steam status shows you are playing "Spacewar," you can often use the standard Steam overlay to invite friends directly. Summary of Connection Details
If the host has mods enabled, the joining players must also have those exact mods installed and activated in the same load order. If you are playing a cracked version, it is highly recommended to first to ensure connectivity works, then add mods one by one.