Running Zenoss 4.2.5 On Port 80

Hello,

We've got an installation of 4.2.5 running on RHEL6 and I wanted to swap it over to running on port 80 as opposed to 8080 but I'm not having much luck here. The things I've tried thus far are as follows

1) Edited the zope.conf and changed the http-server definition to be 80 as opposed to 8080. Zopectl then wouldn't start until switched back to run on 8080
2) Edited both the zope.conf and the zenoss.conf and set http-server to be on 80. Outcome was the same as #1 with zopectl not starting
3) Used a vhost redirect within httpd. This did redirect and the zenoss dashboard opened, however you then receive a popup from zenoss saying it cannot connect to the server and cannot actually use it.

Does anyone else have any suggestions about how to do this, or if its even possible

Thanks in advance!