Hi Remesh, You need to create packet filters to support client applications running on the ISA Server itself. Of course, you should NEVER run client applications on a firewall. HTH, Tom Thomas W Shinder www.isaserver.org/shinder ISA Server and Beyond: http://tinyurl.com/1jq1 Configuring ISA Server: http://tinyurl.com/1llp -----Original Message----- From: Remesh Krishnan [mailto:remeshkrishnan@xxxxxxxxxxxxxxxx] Sent: Sunday, May 11, 2003 10:13 PM To: [ISAserver.org Discussion List] Subject: [isalist] outlook expess http://www.ISAserver.org Hi All, Outlook express is showing error while configuring in the PC which is configured as the ISA server but it works fine in the PC's having the mspclient pls give a solution Best Regards Remesh Krishnan