Changing Your Server’s Host Name
You specify your server’s host name during your very first login to Plesk. If you want to change the host name later, you can do it through Plesk.
To change your server’s host name:
Log in to Server Administration Panel.
Go to Tools & Settings > Server Settings.
Enter the new host name in the Full hostname field.
This should be a fully qualified host name, but without an ending dot (for example,