Trouble with SBS forward lookup zones

i have an SBS server that sits on the LAN behind a firewall etc and has a private IP on the interfaces (bridged). this private IP is accessable from a public IP via NAT rules on the firewall. i then have a host on our domain that points to this public IP (typical stuff). the domain is also registered with CEICW as the domain of the computer (since we are using the Exchange server as a backend mailserver/workgroup server). the problem i am having is that i can't access the server on the LAN using the host on our domain. the DNS resolves to the correct public address but the connections drop (even pings). i have the LAN opened up all the way to itself on the firewall. is this an SBS problem or a firewall problem that i need to explore further?

thanks for any insight,
Chris
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