How To: Disable Firewall on RHEL / CentOS / RedHat Linux

To disable the firewall on RHEL, CentOS, or Red Hat Linux, you can use the systemctl command to stop and disable the firewalld service.

1. Open a terminal and enter the following command to stop the firewalld service:

sudo systemctl stop firewalld

2. To disable the firewalld service so that it does not start automatically at boot, enter the following command:

sudo systemctl disable firewalld

This will disable the firewall on your system. Note that this will leave your system vulnerable to attack, so it is recommended to only disable the firewall temporarily for testing or troubleshooting purposes.

To re-enable the firewall, you can use the systemctl command to start and enable the firewalld service:

sudo systemctl start firewalld
sudo systemctl enable firewalld

This will start the firewall and set it to start automatically at boot.