Yes, i remember that problem, long time ago. I had to add to reference as follows: http://servername/WebService.asmx?WSDL&AspxAutoDetectCookieSupport=1 And i dont remember the reason why, but in my code behind in the load event i have this code: Me.webservice.Url &= "?AspxAutoDetectCookieSupport=1" In case you get an error add this part
Alexei Rodriguez