I can open the LiveZilla Server URI in my webbrowser while the Server Test fails all the time.
If you are able to view the LiveZilla Server Page in your webbrowser while the Server Test fails all the time you may have a forwarding on your webserver which redirects from http://yourwebsite.domain/livezilla to http://www
.yourwebsite.domain/livezilla. That means that you just have to add a www
to your server url in order to pass the Server Test.