ISA Server 2000 and Web Publishing

Hello;

Our company has moved our server to a data center recently. We had to change our external IP address and default gateway ip address on our ISA server. Our ISA 2000 server sits in front of our private network as a firewall. My problem is I changed one of the IPs in Incoming Web Requests to the new 64.38.*.* which points for one of our "secure"websites, and thought everything was ok. When I attempted to change the second IP(which points to a portal website) I found that ISA still had to old (default gw ip). I went through the steps of re-installing the certificates with the correct information but we still have the same problem. Also, when users attempt to access the portal website this message appears..

There is a problem with this website's security certificate.

The security certificate presented by this website was issued for a different website's address.

Security certificate problems may indicate an attempt to fool you or intercept any data you send to the server.

When I try to pull up our "secure" website I get...

"The HTML comments in this page contain the configurationinformation that allows users to edit pages in your web using the Microsoft Web Publishing Wizard or programs which use the Microsoft Web Publishing Wizard such as FrontPad using the same username and password they would use if they were authoring with Microsoft FrontPage. Please refer to the Microsoft's Internet SDK for more information on the Web Publishing Wizard APIs."

Under "Incoming Web Requests" reads the following

ServerName IP Address(64.*.*.*) Authentication(Basic,Integrated) Server Certificate "unavailable"

Please help!!!