When installing Red Hat Linux 7.2 and selecting "Medium level" firewall + customizing firewall to allow http connections (port 80), https connections (port 443) are still blocked. IMHO https should be allowed for users who allow http (or at least an option provided to allow https, too). I fixed this manually adding line -A input -s 0/0 -d 0/0 443 -p tcp -y -j ACCEPT to the end of file /etc/sysconfig/ipchains but probably this should be done automatmc.
We will consider this enhancement in a future release. There is currently a field to enter arbitrary ports in so it is still possible to enable this port through the UI.
This is a configuration decision for the lokkit program.
Fixed in system-config-securitylevel-1.3.5-1.