Check the status of the firewalld service:
systemctl status firewalld.service
The status displays as active (running) or inactive (dead).
If the firewall is active / running, enter this command to stop it:
systemctl stop firewalld.service
To completely disable the firewalld service, so it does not reload when you restart the host machine:
systemctl disable firewalld.service
Verify the status of the firewalld service:
systemctl status firewalld.service The status should display as disabled and inactive (dead). firewalld.service - firewalld - dynamic firewall daemon Loaded: loaded (/usr/lib/systemd/system/firewalld.service; disabled; vendor preset: enabled) Active: inactive (dead)
Repeat these steps for all host machines.
The firewalld service is stopped and disabled. You can now start the CLC and other host machines.
You should re-enable the firewall after installation is complete.