root@pihole:/var/log# sudo service lighttpd restart
Job for lighttpd.service failed because the control process exited with
error code.
See "systemctl status lighttpd.service" and "journalctl -xe" for details.

root@pihole:/var/log# systemctl status lighttpd.service
* lighttpd.service - Lighttpd Daemon
Loaded: loaded (/lib/systemd/system/lighttpd.service; enabled; vendor
Active: failed (Result: exit-code) since Sat 2019-06-15 23:08:38 UTC;
Process: 8387 ExecStartPre=/usr/sbin/lighttpd -tt -f /etc/lighttpd/ligh

Jun 15 23:08:38 pihole lighttpd[8387]: 2019-06-15 23:08:38: (configfile.c
Jun 15 23:08:38 pihole systemd[1]: lighttpd.service: Control process exit
Jun 15 23:08:38 pihole systemd[1]: lighttpd.service: Failed with result '
Jun 15 23:08:38 pihole systemd[1]: Failed to start Lighttpd Daemon.
Jun 15 23:08:38 pihole systemd[1]: lighttpd.service: Service RestartSec=1
Jun 15 23:08:38 pihole systemd[1]: lighttpd.service: Scheduled restart jo
Jun 15 23:08:38 pihole systemd[1]: Stopped Lighttpd Daemon.
Jun 15 23:08:38 pihole systemd[1]: lighttpd.service: Start request repeat
Jun 15 23:08:38 pihole systemd[1]: lighttpd.service: Failed with result '
Jun 15 23:08:38 pihole systemd[1]: Failed to start Lighttpd Daemon.

-- Defined-By: systemd
-- Support: http://www.ubuntu.com/support
--
-- Automatic restarting of the unit lighttpd.service has been scheduled, as the result for
-- the configured Restart= setting for the unit.
Jun 16 00:16:57 pihole systemd[1]: Stopped Lighttpd Daemon.
-- Subject: A stop job for unit lighttpd.service has finished
-- Defined-By: systemd
-- Support: http://www.ubuntu.com/support
--
-- A stop job for unit lighttpd.service has finished.
--
-- The job identifier is 701 and the job result is done.
Jun 16 00:16:57 pihole systemd[1]: lighttpd.service: Start request repeated too quickly.
Jun 16 00:16:57 pihole systemd[1]: lighttpd.service: Failed with result 'exit-code'.
-- Subject: Unit failed
-- Defined-By: systemd
-- Support: http://www.ubuntu.com/support
--
-- The unit lighttpd.service has entered the 'failed' state with result 'exit-code'.
Jun 16 00:16:57 pihole systemd[1]: Failed to start Lighttpd Daemon.
-- Subject: A start job for unit lighttpd.service has failed
-- Defined-By: systemd
-- Support: http://www.ubuntu.com/support
--
-- A start job for unit lighttpd.service has finished with a failure.
--
-- The job identifier is 701 and the job result is failed.