Hi All, I want to authenticate to the ISA based user certificate that was issued from a CA located in the world. When I configure the web listener to: Description Test Networks External Port(HTTP) Disabled Port(HTTPS) 443 Certificate exchange.com Authentication methods SSL certificate Always Authenticate Yes And then I surf to the ISA 2004 from the world I am getting this message: * Error Code: 401 Unauthorized. The server requires authorization to fulfill the request. Access to the Web server is denied. Contact the server administrator. (12209) Those any one can think about something? Thanks a lot.