Server Won't Start or Keeps Going Offline

Common Causes and Solutions

If your server shows "Starting" then immediately goes back to "Offline", work through these checks in order.

1. Check the Console Output

The most important step. Go to the Console tab and read the error message. The error tells you exactly what is wrong. Common errors and their meanings:

• "Unable to access jarfile server.jar" — The server file is missing. Go to Settings → Reinstall, or use the Version Changer to re-download it
• "EULA not accepted" — Open eula.txt in the Files tab and change eula=false to eula=true
• "OutOfMemoryError" — Your server is running out of RAM. See Step 4 below
• "Failed to bind to port" — Another process is using the port, or the port is misconfigured. Try restarting the server. If it persists, contact support
• "Mod/plugin error" or stack trace mentioning a specific mod — A mod or plugin is crashing the server. See Step 3

2. Check Your Server Version and Type

• Make sure your server type and version are set correctly in the Version Changer
• If you recently changed versions, ensure your mods and plugins are compatible with the new version
• When in doubt, try setting the version to latest and reinstalling

3. Remove Recently Added Mods or Plugins

If the server was working before and stopped after adding something new:

1. Remove the last mod or plugin you added
2. Restart the server
3. If it starts, the removed file was the problem. Check for a compatible version or alternative
4. If it still doesn't start, continue removing recent additions one by one

4. Check Resource Usage

• If your server runs out of RAM, it will crash on startup — especially with many mods or plugins
• Remove mods and plugins you don't need to free up resources
• Review your configuration — large view distances, excessive entity spawning, and chunk loaders consume significant resources
• Only consider upgrading your plan if you've already cleaned up your configuration and the issue persists

5. Check Disk Space

Check your disk usage in the panel header. If you're at the limit:

• Delete old backups, unused worlds, or large log files
• Clear the logs folder of old log files

6. Restore from Backup

If you cannot identify the problem and the server was working before:

1. Go to the Backups tab
2. Restore the most recent working backup
3. Start the server

Still Not Working?

Copy the full error from your server console and open a support ticket. The error message helps us diagnose the issue much faster.