You can protect your server with a password so that only players with the password can join. This is especially useful when your server appears in the server list via the server tokens but you still don't want random players to join.
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Open dashboard
Open the dashboard of your server. -
Open settings
Navigate to the Settings. -
Set password
Enter the desired password in the Server Password field and save the setting. -
Restart the server
Restart your server for the change to take effect.