Some more info, based on Service Capture tracing the SOAP calls from the desktop Live Support Operator application:
POST /DesktopModules/CuteSoft_Client/CuteChat/SupportService.asmx HTTP/1.1
User-Agent: Mozilla/4.0 (compatible; MSIE 6.0; MS Web Services Client Protocol 2.0.50727.4200)
Content-Type: text/xml; charset=utf-8
SOAPAction: "http://tempuri.org/SupportLogin"
Host: dev.xxxxx.com [my dnn domain]
But looking into the .cs fiel for SupportService.asmx file we don't see any Method named 'SupportLogin'.
May be the download package for DNN of Cute Live Support has some wrong 'CuteChat' files?
Thanks!