CWA Windows 24.3 error "Unable to connect to the server. Check your network connection and retry"

After upgrade from CWA 23.9.1.104 to CWA 24.3.1.97 users cannot login on CWA Windows with error "Unable to connect to the server. Check your network connection and retry." The URL used for CWA is for NetScaler Gateway and is set via GPO...