Factorio Server Troubleshooting

Players Can't Connect

• Forward port 34197 UDP
• Check firewall rules
• Some routers randomize source ports — try a different port

Server Not in Public Browser

• Verify visibility.public is true
• Check username and token are set correctly
• Token is from factorio.com/profile

Version Mismatch

Server and all clients must be the exact same version. Don't mix Stable and Experimental branches. Update via Reinstall Server in the panel.

Mod Mismatch

All clients need identical mods and versions. Players can use "Sync mods with server" in the server browser.

Desync Errors

Usually caused by mods:

• Remove recently added/updated mods
• Delete local mods folder and let the game re-download
• Verify game files via Steam

Space Age Keeps Re-Enabling

Edit mod-list.json BEFORE first launch. If persistent, delete the space-age, quality, and elevated-rails directories from data/.

Related Guides

• Server Configuration
• Install Mods
• Space Age DLC