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Managing UFW from command line

UFW ( Uncomplicated Firewall ) firewall is a default firewall on Ubuntu 18.04 Bionic Beaver Linux.

Check a current firewall status

By default the UFW is disabled. You can check the status of your firewall by executing the following linux command:

$ sudo ufw status
[sudo] password for nahid: 
Status: inactive

For more verbose output append word verbose to the above command:

$ sudo ufw status verbose
Enable Firewall
To enable firewall execute:
$ sudo ufw enable
Command may disrupt existing ssh connections. Proceed with operation (y|n)? y
Firewall is active and enabled on system startup

Firewall, is now enabled:

$ sudo ufw status
Status: active

Disable Firewall

UFW is quite intuitive to use. To disable firewall execute:

$ sudo ufw disable
Firewall stopped and disabled on system startup

Confirm the firewall status:

$ sudo ufw status
Status: inactive

Managing UFW via graphical user interface

Install gufw package if you wish to manage our UFW firewall via graphical user interface application. Open up terminal and enter:

$ sudo apt install gufw