Unable to install IPA server, Apache is already configured with a listener on port 443

Issue

Upon running ipa-server-install you get the following error:

The log file for this installation can be found in /var/log/ipaserver-install.log
==============================================================================
This program will set up the IPA Server.

This includes:
  * Configure a stand-alone CA (dogtag) for certificate management
  * Configure the Network Time Daemon (ntpd)
  * Create and configure an instance of Directory Server
  * Create and configure a Kerberos Key Distribution Center (KDC)
  * Configure Apache (httpd)

To accept the default shown in brackets, press the Enter key.

Apache is already configured with a listener on port 443:
_default_:443          192.168.123.4 (/etc/httpd/conf.d/ssl.conf:74)
IPA requires that mod_nss be used for port 443.
Aborting installation