Cannot see web server

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http://ubuntuforums.org – Hello there! I can see my web server on my local network and even see the default apache web page, but no one can see it from the outside. I am running a Apple Base Station and I configured port 80 to point to my web server via port mapping. In any case when I try to browse from the outside to my public IP I get a 502 Bad gateway response. Any ideas what I could be doing wrong? The firewall has no rules in it so it shouldnt be the problem. Anyway, lost as to why this isnt working. I am running Ubuntu 12.04.3. Im pretty sure its some kind of port routing issue. Peter (Hardware)