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Installing a Firewall for Ubuntu 8.04 LTS – 9.04 and above.

Turning on the Ubuntu Firewall can protect you even better from hackers who want to hack into your Ubuntu based Firewalls since the Ubuntu Firewall blocks outsiders from getting into your computer. Turning on the Ubuntu Firewall from Terminal only takes a few minutes to do to increase Ubuntu’s network and internet security.

Login with an Administrator account for Ubuntu.

Start Terminal by going to Applications>Accessories Terminal.

Ubuntu Terminal command window

Type these commands in Terminal Command Prompt:

sudo ufw allow ssh/tcp

[sudo] password for USER:Your Admin. USER Password

sudo ufw logging on

sudo ufw enable

sudo ufw status

My Terminal Screen

johnson@johnson-desktop:~$ sudo ufw allow ssh/tcp

[sudo] password for johnson:

Rules updated

johnson@johnson-desktop:~$ sudo ufw logging on

Logging enabled

johnson@johnson-desktop:~$ sudo ufw enable

Firewall is active and enabled on system startup

johnson@johnson-desktop:~$ sudo ufw status

Status: active

To Action From

— —— —-

22/tcp ALLOW Anywhere

installing firewall in terminal prompt

Source for more information on the firewall for Ubuntu https://wiki.ubuntu.com/UbuntuFirewall

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