firewalld.service: Start operation timed out. Terminating.

If you are getting the error below:

systemd[1]: firewalld.service: Start operation timed out. Terminating.
systemd[1]: Failed to start firewalld – dynamic firewall daemon.

It may be due to the fact that the process is stuck somehow. Just run the following command to solve the issue:

Terminate the process

pkill -f firewalld

Start firewalld

firewall-cmd --state
systemctl start firewalld
firewall-cmd --state