In a case like this, changing the Admin Port for Zentyal's Web UI - exactly WHICH configuration file would be edited? It was overwriting everything I was trying to do when using /etc/init.d/zentyal apache restart - REALLY bothering - I spent nearly 3-4 hours on this, when I finally figured out that no matter what I edited, it was going to revert back - so I looked for another method to solve this issue. I tried to edit apache2.conf, and apache.bak in /var/lib/zentyal/conf/, apache2.conf in /etc/apache2, as well as ports.conf in /etc/apache2 <-- those two seem to not be a part of the Zentyal UI, simply the Webserver.
I'm just curious. Yaknow, for science. =)