[SOLVED] How to enable firewall on Centos 7?

Issue

My firewall is currently inactive.

# systemctl status firewalld
firewalld.service
    Loaded: masked (/dev/null)
    Active: inactive (dead)

I used the following command to enable the firewall

$systemctl unmask firewalld

but I got this error

# systemctl unmask firewalld
Failed to issue method call: Access denied

Please advise.

Thanks in advance!

Solution

Try this:

sudo systemctl restart firewalld
sudo systemctl enable firewalld

But before you should install firewalld. You can use yum for that:

sudo yum install firewalld

Answered By - gomons

Answer Checked By - Candace Johnson (WPSolving Volunteer)