Airport Express dmz (Default address) not working same with port forwarding

My configuration is as follows: MacBook Pro w/10.5.4 Server and standard, Comcast HighSpeed cable, Airport Express.
With the laptop connected directly, all services work fine. Specifically Web serving, Quicktime streaming server.
With Airport connected, all browsing works. Forwarding to web server port 80 works.
Forwarding to QTSS doesn't work.
Setting the default address (DMZ) doesn't solve problem.
Ideas?

I used the Expess presets. Ports 554 and 7070. I even tried adding UDP ports from the setup manual.
My real issue is that the DMZ should direct all traffic to the server and it doesn't seem to be working.

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