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.

2456 UDP (game), 2457 UDP (query), 2458 UDP (optional). Open all three in firewall.

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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