Login to Command Center. From the server list, select the server for which you would like to change settings by pressing it's Manage button. Stop the server. Click the Files tab. Click on the file that says ProjectZomboid64.json to edit. Fine the line -Dzomboid.steam=1 and change the 1 to a 0. Restart your server and your Non-Steam friends should be able to join your server.. Quick Answer Yes - if you want friends to join your Project Zomboid game, you'll need to open UDP port 16261 on your router (and ideally UDP port 16262 as well). Without proper port forwarding, external players cannot connect to your server or will experience lag due to Steam relay fallbacks.
Attempting to host a server for friend. Invited through game. Clicked allow. No go. Invited through Steam. No go. Always tells them "Host must allow you to join." Any help for this?. Has anyone else had an issue with hosting multiplayer server Says: " Host must Allow User to Join" I double click my friends name, and then click allow, but it still says must host must allow to join. I have checked all of my setting and have not changed anything since the last time I had a user join, but for some reason it does not work. currently attempting to uninstall and reinstall the.