From the Novell ZENworks 7 Linux Management Installation Guide:

The server must allow traffic on TCP ports 80, 443, 524, 1299, 2544, 5506, 10389, and 10636.

The server cannot run other services on port 80. If Apache or another service is binding to port 80, remove the service or change the service's port.

This poses a problem to us as we're running several different web apps and apache is binding to port 80. Is there a way to set up a secondary IP or some other workaround?