when installing mod_ssl RPM, a file called /etc/httpd/conf.d/ssl.conf is

placed on disk. This file already has Listen 443 directive and so, if
the user chose port 443 then we will end up with 2:
Listen 443
directives. One in the default ssl.conf file and another in
configurations/apache/kaltura.ssl.conf.
This will cause apache to fail when initing since there will be a double
attempt to open a listener.