Some commands I often use when working with RedHat 8.x.
Check if the firewall is active and running on RedHat 8.x
systemctl status firewalld
To stopt the firewall daemon on RedHat 8.x:
systemctl stop firewalld
Start the firewall daemon on RedHat 8.x:
systemctl start firewalld
To disable the firewall even after reboot:
systemctl disable firewalld
Enable the firewall daemon after reboot:
systemctl enable firewalld