How to enable/disable firewall on Ubuntu 20.04 LTS Focal Fossa Linux

The default Ubuntu firewall is ufw, with is short for “uncomplicated firewall.” Ufw is a frontend for the typical Linux iptables commands, but it is developed in such a way that basic firewall tasks can be performed without the knowledge of iptables.

Additionally, ufw can be managed from a graphical interface. In this tutorial, you will learn how to enable and disable firewall on Ubuntu 20.04 LTS Focal Fossa Linux from both command line and GUI.

In this tutorial you will learn:

  • How to check firewall status
  • How to enable/disable firewall
  • How to control firewall settings from GUI

How to enable/disable firewall on Ubuntu 20.04 LTS Focal Fossa

How to enable/disable firewall on Ubuntu 20.04 LTS Focal Fossa

Software Requirements and Conventions Used

Software Requirements and Linux Command Line Conventions
Category Requirements, Conventions or Software Version Used
System Installed or upgraded Ubuntu 20.04 Focal Fossa
Software N/A
Other Privileged access to your Linux system as root or via the sudo command.
Conventions # – requires given linux commands to be executed with root privileges either directly as a root user or by use of sudo command
$ – requires given linux commands to be executed as a regular non-privileged user

How to enable/disable firewall on Ubuntu 20.04 LTS Focal Fossa Linux step by step instructions



  1. The first thing we should do is check the status of the firewall to see if it’s on or off.
    $ sudo ufw status
    Status: active
    

    As seen here, our firewall is currently active (on). For more detailed output regarding your current firewall settings, add the verbose option.

    $ sudo ufw status verbose
    
  2. To disable the Ubuntu firewall, execute the following command.
    $ sudo ufw disable
    
  3. If you decide you need to enable the Ubuntu firewall again later, you can run the following command.
    WARNING
    Please note that by enabling your firewall you may get disconnected if you are currently using SSH to remotely connect to your Ubuntu server.
    $ sudo ufw enable
    

Enable or Disable Ubuntu firewall via GUI

To control ufw via GUI, you need to install the gufw package with the following command.

$ sudo apt install gufw

Then, start the gufw application and click on the Status switch to either enable or disable the firewall. See the video below for more help.



How to enable/disable firewall on Ubuntu Linux

Closing Thoughts

In this tutorial, you learned how to enable or disable the system firewall (ufw) in Ubuntu 20.04. You also saw how to check the current status of the firewall. Normally, you will not need to disable the firewall unless for testing purposes or something similar. If you need to allow a port through the firewall, see our tutorial on how to Open/Allow incoming firewall port on Ubuntu 20.04.