ntop is a great application. One of its best features is the ready-to-go web server it comes with. You can tell ntop to launch an http or https only (or both) server when it starts. By default ntop will listen on port 3000 for incoming http/https requests.
Unfortunately I like to keep everything organized. I'd like to access my ntop without having to poke any more holes into my firewall. Optimally I wanted to configure an apache virtual host to point to some tidy folder (perhaps /usr/share/ntop/webserver) and then rely on my already configured apache to host up the ntop web files. Well it's not the easy, but it is possible!