Apache does not starting after disabling IPv6

Issue

After disabling IPv6 interface on RHEL 7, the JBCS Apache service fails to start with the following message " (98)Address already in use: AH00072: make_sock: could not bind to address 127.0.0.1:443" as shown here:

# systemctl status jbcs-httpd24-httpd.service 
● jbcs-httpd24-httpd.service - The Apache HTTP Server
   Loaded: loaded (/usr/lib/systemd/system/jbcs-httpd24-httpd.service; enabled; vendor preset: disabled)
   Active: failed (Result: exit-code) since Fri 2018-10-05 11:43:56 EDT; 5s ago
  Process: 18290 ExecStop=/bin/kill -WINCH ${MAINPID} (code=exited, status=1/FAILURE)
  Process: 18289 ExecStart=/opt/rh/jbcs-httpd24/root/usr/sbin/httpd $OPTIONS -DFOREGROUND (code=exited, status=1/FAILURE)
 Main PID: 18289 (code=exited, status=1/FAILURE)
   Status: "Reading configuration..."

Oct 05 11:43:56 example.com systemd[1]: Starting The Apache HTTP Server...
Oct 05 11:43:56 example.com httpd[18289]: (98)Address already in use: AH00072: make_sock: could not bind to address 127.0.0.1:443
Oct 05 11:43:56 example.com httpd[18289]: no listening sockets available, shutting down
Oct 05 11:43:56 example.com httpd[18289]: AH00015: Unable to open logs
Oct 05 11:43:56 example.com systemd[1]: jbcs-httpd24-httpd.service: main process exited, code=exited, status=1/FAILURE
Oct 05 11:43:56 example.com kill[18290]: kill: cannot find process ""
Oct 05 11:43:56 example.com systemd[1]: jbcs-httpd24-httpd.service: control process exited, code=exited status=1
Oct 05 11:43:56 example.com systemd[1]: Failed to start The Apache HTTP Server.
Oct 05 11:43:56 example.com systemd[1]: Unit jbcs-httpd24-httpd.service entered failed state.
Oct 05 11:43:56 example.com systemd[1]: jbcs-httpd24-httpd.service failed.