Hello!
After starting the Management Console Serv-U an error:g_sAjaxNotSupported - definition does not exist.Serv-U:15.1.0
Windows Server 2003 SP2
It sounds like you might be using Internet Explorer 6, since that's the default in Server 2003. To use Serv-U, you must use Internet Explorer 8+ or an alternative browser (Chrome, Firefox, etc.). If you install an alternative browser, just right-click on the Serv-U tray and enable "Use System Browser" to tell Serv-U to use the default system browser instead of IE.