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Still can't access remote admin on D-Link DI-804

This is supposed to be easy but I just can't get it to work!!!????

I changed the remote admin port to 8080, 2000, 20000, etc, but I still can't connect to the web interface from **outside** the LAN. The browser just returns with a "The page cannot be displayed etc.. etc.. Cannot find server or DNS Error" standard Internet Explorer error message. Within the LAN I can enter the admin tool without a problem on all configured ports. I don't know if it's relevant, but I have a DMZ zone set up that redirects to 192.168.0.100. I tried disabling the DMZ, but I still can't connect to the admin web interface.

I have the same exact internet gateway/router in another office, with the same exact problem. Can anyone tell me what's happening here????

By the way, DMZ points to a IIS Web Server (port 80) in the LAN, so my ISP is NOT blocking port 80.

Thanks for your help..