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Valheim Server Won't Start – Dedicated, Mods & Port 2456

Valheim dedicated server won't start? Port 2456–2458 UDP, BepInEx/mods, world backup & SteamCMD – Valheim troubleshooting.

Game servers

Quick answer: Valheim won't start: open ports 2456–2458 UDP, check world backup and SteamCMD validate after updates.

If you landed here: Valheim dedicated crashes on start, world won't load or server restart loops.

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Frequently asked questions (FAQ)

Valheim server won't start – first steps?
Read panel logs. Open ports 2456–2458 UDP, check world backup, SteamCMD validate after game update.
Valheim mods cause crash?
Disable BepInEx + mods one by one. Mod versions must match on server and client.
Which ports for Valheim?
2456 UDP (game), 2457 UDP (query), 2458 UDP (optional). Open all three in firewall.
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