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Troubleshooting Your Minecraft Server

Common Minecraft server issues and how to fix them, including authentication errors, startup crashes, version mismatches, and connection problems.

This guide covers common issues you may encounter on your Minecraft server and their solutions.

"Failed To Verify Username!" Or "Authentication Servers Are Currently Not Available"

This error stems from inability to reach Mojang's authentication servers. It's permanent for Minecraft versions 1.16.5 and older due to TLS certificate incompatibility with Java 8.

For Versions 1.16.5 And Older

Option 1: Update to a newer version (recommended)

  • Upgrade your server to version 1.17 or newer.
  • These versions use Java 17, which supports modern TLS certificates.

Option 2: Enable offline mode

  • Enable offline mode to bypass authentication requirements.
  • Caveat: Anyone can join without account verification.
  • Implement an authentication plugin for added security.

For Versions 1.17 And Newer

If you encounter this error on modern versions:

  • Restart your PC and router, then retry after several minutes.
  • Authentication servers may be temporarily unavailable.

Server Won't Start (Immediate Crashing)

If your server fails to launch or crashes instantly:

  • Verify the server .jar file configuration in Server Options.
  • Modify the Java Version in Server Options and restart; retry multiple times if needed. Automatic succeeds in most cases.
  • Confirm successful file uploads; SFTP is recommended.
  • Review Console or System → Audit Logs for detailed error information.

Version Compatibility

If you experience trouble with mods or plugins:

  • Verify mod/plugin compatibility on its download page.
  • Confirm your server runs the correct game version (Forge, Fabric, Spigot, Paper, etc.).
  • Mod loaders like Forge and NeoForge are incompatible with each other.
  • Plugins require Spigot, Paper, or comparable server software (not vanilla or Forge).

Connection Refused

If you're unable to access your server with "connection refused" errors:

  • Restart both your game client and server.
  • If using mods, ensure your client has identical mods installed.
  • Verify you're using the correct IP address for connection.

Mismatched Mods Or Versions

When connecting to modded servers with compatibility issues:

  • Confirm your client contains matching mods as the server.
  • Install missing mods or remove conflicting ones from both environments.
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