A simple step-by-step process to diagnose and fix common server problems

Running your own Valheim server is a great way to explore the world of Vikings with friends. But like any game server, issues can occasionally appear. The server may fail to start, players may not be able to connect, or performance might suddenly drop.

The good news is that most Valheim server problems can be diagnosed quickly if you follow a structured troubleshooting process.

This guide walks you through the most common Valheim server issues and how to fix them step by step.

You can also find official information about the game on the Valheim website.

Step 1: Identify the problem first

Before making any changes, determine what exactly is happening.

Ask yourself:

• Does the server start at all?

• Does it crash immediately?

• Can players see the server in the list?

• Can players connect but get disconnected?

• Is the problem related to performance or lag?

Avoid randomly changing configuration files before understanding the symptom.

Step 2: Check the server logs

Logs are your most important troubleshooting tool.

Important Valheim server logs usually include:

• output_log.txt

• Player.log

• startup console logs

Look for messages such as:

• error

• failed to load

• missing file

• network error

• mod errors

If the server fails to start, the logs will usually explain why.

Step 3: Verify your server configuration

Many Valheim server issues come from incorrect configuration settings.

Check the following values carefully.

Server name

World name

Password

Common mistakes include:

• incorrect world names

• missing quotation marks

• incorrect password formatting

Make sure the world file actually exists in the worlds folder.

Step 4: Check port forwarding

If players cannot connect to your server, the problem is often related to network ports.

Valheim requires the following ports:

Make sure these ports are:

• open in your firewall

• forwarded in your router

• not used by another service

If the ports are blocked, players will not be able to join the server.

Step 5: Verify server and client game versions

Another common problem occurs when the server and players run different game versions.

Symptoms include:

• players cannot connect

• version mismatch errors

• connection failures

Make sure:

• the server is fully updated

• players are using the same game version

Updating the server through SteamCMD usually resolves version mismatch issues.

Step 6: Troubleshooting mods

Mods are one of the most common causes of Valheim server issues.

If you're using mods, check:

• mod compatibility

• correct installation

• mod version matching

Common mod frameworks include:

• BepInEx

• Jotunn

If you suspect a mod problem:

1. Disable all mods

2. Start the server

3. Add mods back one by one

This helps isolate the mod causing the problem.

Step 7: Players cannot see the server

If your server is running but not visible in the server browser, check the following:

• correct ports are open

• server is set to public

• firewall rules allow the server

You can also try connecting directly using the IP address and port.

Example:

Direct connections often work even if the server does not appear in the public list.

Step 8: Server lag or performance issues

Performance issues can occur when:

• too many structures exist in one area

• too many players gather in the same location

• the server hardware is overloaded

Valheim uses a physics-heavy world simulation, which means performance can drop if many objects are present.

To improve performance:

• reduce build density

• restart the server regularly

• ensure the server runs on adequate hardware

Step 9: World not loading

If the world fails to load or resets unexpectedly, check:

• world file integrity

• backup files

• server restart logs

Valheim stores world files in the worlds folder.

If the world becomes corrupted, restoring from a backup world file can resolve the issue.

Step 10: Restart the server properly

After making configuration changes, always restart the server properly.

Recommended process:

1. Stop the server completely

2. Wait 20–30 seconds

3. Start the server again

Avoid editing files while the server is running unless necessary.

Golden rules of Valheim server troubleshooting

When debugging a Valheim server, remember these principles:

✔ Change one setting at a time
✔ Always read the server logs
✔ Verify game version compatibility
✔ Test with mods disabled if necessary
✔ Keep backups of world files

These habits make troubleshooting much faster and safer.

When to contact server support

If the issue continues even after testing the steps above, contact your hosting provider.

Support should be contacted if:

• the server does not generate logs

• the server will not start with a clean installation

• files appear to be missing

• hardware performance issues are suspected

In these situations, the host can investigate the server environment directly.

For all your server hosting needs head to: www.Imperiumhosting.net

TrustPilot| Discord|  Facebook| Twitter| Instagram| Youtube| Bluesky