Failed to check session lock

How to Fix the 'Failed to Check Session Lock' Error in Minecraft

The "Failed to check session lock" error can randomly occur when a Minecraft server is unable to access the session.lock file. This issue often leads to server crashes or prevents the server from starting. Fortunately, fixing this error is quick and easy!

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Understanding the Error

Error message:

net.minecraft.server.WorldConflictException: Failed to check session lock, aborting.

This issue typically arises when the server is unable to verify or access the session.lock file in your world folder. This can happen due to corruption, improper shutdowns, or file access conflicts.

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Steps to Fix the Error

Follow these steps to resolve the issue:

1. Stop the Server Log into your game control panel and stop the Minecraft server to prevent further issues.

2. Access the File Manager Navigate to the server’s file manager through the control panel.

3. Locate the World Folder Open the folder containing your Minecraft world files (e.g., world, world_nether, or world_the_end).

4. Delete the session.lock File Find and delete the session.lock file in each world folder.

5. Restart the Server Start your server again. Minecraft will automatically regenerate a new session.lock file.

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Preventing Future Session Lock Issues

• Proper Server Shutdowns: Always shut down the server using the control panel or server commands instead of force-closing it.

• Backup Regularly: Regular backups help safeguard your world files against corruption.

• Monitor Disk Space: Ensure the server has enough disk space to prevent file write issues.

By following this guide, you can quickly resolve the "Failed to check session lock" error and keep your Minecraft server running smoothly!