ZCS 7.2.0 not listening on port 443
I installed Zimbra Collaboration Server 7.2.0 on a Centos 5.8 machine as our mail mirror server. I am able to reach the login page if I open a browser and put the IP Address into the Address bar. However, if I put https:// before the IP Address on the Address bar I get a page saying: "Unable to connect". When I run "netstat -an | grep 80" on the mail mirror server, it shows that port 80 is listening. When I run "netstat -an | grep 443" on the mail mirror server, it does not give any response which tells me that port 443 is not listening.
1) I am not sure why Zimbra is not listening on port 443
2) Is there a configuration file for Zimbra that I can change to force Zimbra to listen on port 443?