Fixing the 'Failed to verify username' Error

What this error means

The "Failed to verify username!" error occurs when a client attempts to join a server, but the Minecraft authentication servers cannot verify their session. This typically happens because the client's session has expired or the server is unable to communicate with Mojang's authentication services.

How to fix it

On AwakeNode

Log in to your AwakeNode panel.
Navigate to the File Manager.
Locate the server.properties file and click to edit it.
Ensure online-mode is set to true.
Save the file and restart your server using the button on the main console page.

On other hosts / manually

Access your server files via SFTP or your host's file manager.
Open server.properties in a text editor.
Find the line online-mode=... and ensure it is set to true.
If you are running a cracked or offline server, this must be set to false, but note that players will not be authenticated against Mojang servers.
Save the file and restart your server instance.

Troubleshooting connection issues

If the error persists while online-mode is set to true:

Restart your Minecraft client: Often, a simple restart refreshes your session token.
Check server status: Ensure Mojang's authentication services are online.
Contact Support: If you suspect a network-level issue preventing your server from reaching Mojang, open a ticket with AwakeNode support for further investigation.

Questions

Does setting online-mode to false make my server insecure?

Yes, setting online-mode to false disables player authentication, allowing anyone to join using any username. This makes your server vulnerable to griefing and impersonation.

Why do my players get this error even when online-mode is true?

This usually means the player's session token has expired. Asking the player to close their Minecraft client and log back into the Minecraft Launcher usually resolves the issue.

Can I fix this by changing my server's RAM?

No, this error is related to authentication services and not server performance. Increasing your RAM will not resolve verification issues.

More error fixes

java.lang.NoClassDefFoundError / ClassNotFoundExceptionLearn how to resolve java.lang.NoClassDefFoundError and ClassNotFoundException errors on your Minecraft server with our step-by-step troubleshooting guide.java.lang.NoSuchMethodError / NoSuchFieldErrorLearn how to resolve java.lang.NoSuchMethodError and NoSuchFieldError on your Minecraft server by identifying version mismatches and plugin conflicts.Exception in server tick loopLearn how to diagnose and resolve the 'Exception in server tick loop' error on your Minecraft server with our step-by-step troubleshooting guide.java.net.SocketException: Connection resetTroubleshoot the java.net.SocketException: Connection reset error on your Minecraft server. Learn how to diagnose network and client-side issues.