I just installed apache2 this morning and am able to start the server and correctly pull up the sample webpage at http://localhost.
I am behind a router so I set the router up for port forwarding to the proper server computer.
However, when I enter http:// to access my page into my browser, it does not work, and says server not found.
Can anyone please suggest what might be the problem here? This is a typical installation of desktop Ubuntu 12.04.