# Factorio Server Troubleshooting (/docs/factorio/fix-issues)



import { Step, Steps } from 'fumadocs-ui/components/steps';

Players Can't Connect [#players-cant-connect]

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

Server Not in Public Browser [#server-not-in-public-browser]

* Verify `visibility.public` is `true`
* Check `username` and `token` are set correctly
* Token is from [factorio.com/profile](https://factorio.com/profile)

Version Mismatch [#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 [#mod-mismatch]

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

Desync Errors [#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 [#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 [#related-guides]

* [Server Configuration](/docs/factorio/server-config)
* [Install Mods](/docs/factorio/mod-setup)
* [Space Age DLC](/docs/factorio/space-age)