Hi all, I'm using ISA Server in Cache Mode and the issue that I have is trying to read hotmail email through pop using Outlook Express but I receive this message : "Unable to poll for new messages on your HTTP server. Account: 'Hotmail', Server: 'http://services.msn.com/svcs/hotmail/httpmail.asp', Protocol: HTTPMail, Server Response: 'Proxy Authentication Required ( The ISA Server requires authorization to fulfill the request. Access to the Web Proxy service is denied. )', Port: 0, Secure(SSL): No, Error Number: 0x800CCC37" BTW, I enable the authentication mode for web proxy. Any ideas ? Thanks. -Zul