Connection lost could not connect to a default or fallback server

What does this error mean?

Your Minecraft server client cannot connect to a sub-server on a bungee server.

If the issue does not resolve after 5 minutes we recommend you contact our support team here as soon as possible!

What causes this error?

This happens when the sub-server is either offline or it has crashed.

What should I do?

Try to restart the server and see if you're able to connect.

Try to join the server directly without using the bungee server.

Double check and ensure the config is correct.