OWA and the outside world

I have an SBS 2003 server with OWA and RWW enabled. I forwarded ports 80 and 443 to the server through the firewall.

Internally the sites both work fine. But outside of the network neither of them work.

The firewall logs show the incoming request and what seems to be a response going out on a random port over 61000.

Any ideas why I can’t get a connection with a remote client?