Quick answer: Factorio won't start: read factorio-current.log, check mods, test save backup and open port 34197 UDP.
If you landed here: Dedicated server crashes on start, mod errors in logs or restart loop in panel.
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Frequently asked questions (FAQ)
Factorio server won't start – first steps?
Read factorio-current.log. Common: mod version mismatch, corrupt save, bad server-settings.json, port 34197 in use.
Mod loading failed in Factorio?
Update or remove mods in mods/ one by one. Check server-mod-settings.json. All mods on same Factorio version.
Which port for Factorio dedicated?
34197 UDP (default). Open in firewall and panel.