Uncomplicated Firewall is a program for managing a netfilter firewall designed to be easy to use. It uses a command-line interface consisting of a few simple commands, and uses iptables for configuration. UFW is available by default in all Ubuntu installations since 8.04 LTS

The Uncomplicated Firewall (UFW) is a command-line firewall abstraction layer that automatically uses either iptables or nftables as a back-end firewall. UFW is a tool that minimizes the effort of setting up a firewall by starting with an optimal default configuration.

Let's follow the below steps for installing UFW (if not available) on Ubuntu System

ssh to ubuntu server with root login and execute the below commands to update the package and install ufw

Next Step: Let's try to add few rules, we will block all incoming request except ssh (port 22) & allow all outgoing request as well.

# Allow SSH connections (replace 22 with your SSH port if different)

Now ufw rules are applied and enabled, You can modify the rules as needed for your specific use case.

Next step, we will see how to reset existing ufw rules and disable ufw.

To reset the Uncomplicated Firewall (UFW) using a script, you can follow these steps:

In this blog I will explain how to install, setup (adding rules) & reset UFW (Uncomplicated Firewall) on Ubuntu.

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