Therein lies the problem. Launch the connect to the internet wizard, select enable firewall, and check the box for Outlook over the Internet. This will setup the ISA rule for you. Amy Babinchak Harbor Computer Services (248) 546-6056 office (248) 890-1794 mobile http://isainsbs.blogspot.com http://keepitsecure.blogspot.com http://www.harborcomputerservices.net ________________________________ From: isalist-bounce@xxxxxxxxxxxxx [mailto:isalist-bounce@xxxxxxxxxxxxx] On Behalf Of William Holmes Sent: Thursday, October 05, 2006 1:02 PM To: isalist@xxxxxxxxxxxxx Subject: [isalist] SBS ISA 2004 and Outlook over http/rpc Hello, I have a Small Business Server 2003 with ISA 2004. I would like to be able to use RPC over https. However when I add a rule to publish the RPC Proxy on my SBS server it caused my OWA to stop working and returns the Error Code: 500 Internal Server Error. The target principal name is incorrect. The publishing rule was separate from the OWA rule. Removing the RCP rule restored OWA's functionality. I set the RPC publishing rule up according to: http://www.microsoft.com/technet/isa/2004/plan/exchage2003.mspx In the section: Using ISA Server with Exchange Server 2003 Walk-through Procedure To Configure RPC over HTTP for Outlook 2003 My Setup is as follows. 1. I have two web listeners: One for http, and another for https. The https listener is configured with Verisign certificate. 2. The IIS server is configured with a certificate issued by my own CA. The principal name for this certificate matches the fully qualified domain name of the internal interface on the SBS server. OWA works fine so long as I don't attempt to publish the rpc proxy. Could anyone point me to a the proper way to set this up? Thanks Bill