troubleshooting Question

Windows 2003 / IIS6 / Dual NIC configuration

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jmpawson asked on
NetworkingNetworking Hardware-OtherDHCP
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I have a small LAN with several HP Proliant servers all running Windows 2003.  One server runs Exchange (including OWA and RPC over HTTP), another running IIS with the companies Intranet on.

The firewall points port 443 at the Exchange server for Web Outlook and 'RPC over HTTP proxy' for remote Outlook users.  
The firewall also points port 8443 at the IIS server for secure web access to the company Intranet
Port 80 is closed

The IIS Server had two network cards in configured as a team using 'HP Networking' configured to a single IP address.

I now want to run a public 'Extranet' site on this server to allow access to share some of the files / database resources on the IIS box.  I did the following:

Added a third NIC to the IIS server and configured it with a seperate subnet to the main LAN
Added a second firewall with a separate public IP address, pointing ports 80 and 443 to the new NIC
Registered a new domain, and pointed the DNS for www.newdomain.net at the new public IP address
Created a new website in IIS listening on the new internal IP address, using a host header value of the new domain name, and installed a new SSL certificate on port 443.

It dosen't work!  When i setup the new NIC I get the following warning "Multiple default gateways are intended to provide redundancy to a single network (such as an Intranet or the Internet).  They will not function properly when the gateways are on two seperate disjoint networks (such as one on the intranet and one on the Internet).  Do you want to save this configuration?"  to which i say yes.

I am guessing my lack of TCP/IP wherewithall has let me down here - please help!?  Thanks in advance.
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