D-Link router is blocking access to my wap site

Archived from groups: comp.security.firewalls (More info?)

I have a wap site for accessing wml pages.

I experience no problems if I connect my webserver directly to the
internet, but if my webserver is behind my D-Link DI-824VUP router
then I cannot access the site from my cell phone. I get a

500: Cannot connect to site error.

I can however always access the site from a web browser. So im
guessing my router doesnt know how to respond to requests from a cell
phone? Ive forwarded ports 80 & 9201-9203 to my webserver and have
opened all ports for the firewall with still no luck. What other
settings can I change to get this to work?

-Nick