$ systemctl status firewalld.service
● firewalld.service - firewalld - dynamic firewall daemon
   Loaded: loaded (/lib/systemd/system/firewalld.service; enabled; vendor preset: enabled)
   Active: failed (Result: timeout) since Fri 2018-06-01 18:31:25 CDT; 4min 12s ago
     Docs: man:firewalld(1)
  Process: 2160 ExecStart=/usr/sbin/firewalld --nofork --nopid $FIREWALLD_ARGS (code=killed, signal=TERM)
 Main PID: 2160 (code=killed, signal=TERM)

Jun 01 18:29:55 ben79-pc systemd[1]: Starting firewalld - dynamic firewall daemon...
Jun 01 18:31:25 ben79-pc systemd[1]: firewalld.service: Start operation timed out. Terminating.
Jun 01 18:31:25 ben79-pc systemd[1]: firewalld.service: Failed with result 'timeout'.
Jun 01 18:31:25 ben79-pc systemd[1]: Failed to start firewalld - dynamic firewall daemon.