How can I change the firewall port in CentOS 7?

8 months ago

William Carter

2 minutes

To modify the port configuration of CentOS 7 firewall, you can follow these steps:

Connect to a CentOS 7 server using SSH.
To check the current firewall status, input the following command:

sudo systemctl status firewalld

If the firewall is currently running, you can use the following command to stop the firewall:

sudo systemctl stop firewalld

To check the current firewall rules, type the following command:

sudo firewall-cmd --list-all

To open the required ports for modification, such as TCP ports 80 and 443, use the following command:

sudo firewall-cmd --zone=public --add-port=80/tcp --permanent
sudo firewall-cmd --zone=public --add-port=443/tcp --permanent

Reload the firewall configuration to make the changes take effect.

sudo firewall-cmd --reload

View the new firewall rules.

sudo firewall-cmd --list-all

Finally, activate the firewall and set it to start up automatically.

sudo systemctl start firewalld
sudo systemctl enable firewalld

This successfully modified the port configuration of the CentOS 7 firewall. Remember to only open necessary ports when modifying firewall rules to ensure server security.