Unable to restart httpd service on IPA server

Issue

• Restarting IPA service using ipactl restart fails and systemctl status ipa.service shows:

root@ipa-server:/root> systemctl status ipa.service
ipa.service - Identity, Policy, Audit
   Loaded: loaded (/usr/lib/systemd/system/ipa.service; enabled)
   Active: failed (Result: exit-code) since Mon 2017-04-03 10:47:46 IST; 10min ago
  Process: 19844 ExecStart=/usr/sbin/ipactl start (code=exited, status=1/FAILURE)
 Main PID: 19844 (code=exited, status=1/FAILURE)

Apr 03 10:47:44 ipa-server ipactl[19844]: Shutting down
Apr 03 10:47:46 ipa-server ipactl[19844]: Aborting ipactl
Apr 03 10:47:46 ipa-server ipactl[19844]: Starting Directory Service
Apr 03 10:47:46 ipa-server ipactl[19844]: Starting krb5kdc Service
Apr 03 10:47:46 ipa-server ipactl[19844]: Starting kadmin Service
Apr 03 10:47:46 ipa-server ipactl[19844]: Starting ipa_memcached Service
Apr 03 10:47:46 ipa-server ipactl[19844]: Starting httpd Service   <---------
Apr 03 10:47:46 ipa-server systemd[1]: ipa.service: main process exited, code=exited, status=1/FAILURE
Apr 03 10:47:46 ipa-server systemd[1]: Failed to start Identity, Policy, Audit.
Apr 03 10:47:46 ipa-server systemd[1]: Unit ipa.service entered failed state

• Restarting httpd service manually on IPA server fails and systemctl status httpd.service shows:

root@ipa-server:/root> systemctl status httpd.service
httpd.service - The Apache HTTP Server
   Loaded: loaded (/usr/lib/systemd/system/httpd.service; disabled)
   Active: failed (Result: exit-code) since Mon 2017-04-03 10:47:44 IST; 10min ago
     Docs: man:httpd(8)
           man:apachectl(8)
  Process: 19991 ExecStop=/bin/kill -WINCH ${MAINPID} (code=exited, status=1/FAILURE)
  Process: 19986 ExecStart=/usr/sbin/httpd $OPTIONS -DFOREGROUND (code=exited, status=1/FAILURE)
 Main PID: 19986 (code=exited, status=1/FAILURE)
   CGroup: /system.slice/httpd.service

Apr 03 10:47:43 ipa-server systemd[1]: Starting The Apache HTTP Server...
Apr 03 10:47:43 ipa-server httpd[19986]: (98)Address already in use: AH00072: make_sock: could not bind to address [::]:443
Apr 03 10:47:44 ipa-server systemd[1]: httpd.service: main process exited, code=exited, status=1/FAILURE
Apr 03 10:47:44 ipa-server kill[19991]: kill: cannot find process ""
Apr 03 10:47:44 ipa-server systemd[1]: httpd.service: control process exited, code=exited status=1
Apr 03 10:47:44 ipa-server systemd[1]: Failed to start The Apache HTTP Server.
Apr 03 10:47:44 ipa-server systemd[1]: Unit httpd.service entered failed state.
Apr 03 10:47:44 ipa-server systemd[1]: Stopped The Apache HTTP Server.