sentinel

I have a Windows 2003 IIS 6 server with 2 NIC's, one on Subnet A and the other on Subnet B. All ports have been opened on the firewall between Subnet A and Subnet B. There is only one website configured with an IP address from Subnet A. Clients on Subnet A can access the website although clients on Subnet B can not access the website. If I remove the second NIC (the one on Subnet B ) then Subnet B can access the website on Subnet A. Although I can't use this configuration because of other applications requiring the server to be dual homed. How can I allow clients on Subnet B to access the website on Subnet A when the webserver is dual homed?