TUX.RE Forum

Posted: **Sat Apr 25, 2026 10:56 am**

Installing and Configuring UFW on Debian

UFW (Uncomplicated Firewall) is a simple and user-friendly firewall management tool for Linux systems. It acts as a frontend for iptables/nftables and allows administrators to control network traffic without writing complex rules.

It is ideal for securing Debian servers running services like SSH, web servers, mail systems, or DNS.

Why Use UFW?

A firewall is a critical part of server security. With UFW you can:

Block unwanted incoming connections
Allow only required services
Protect SSH access
Manage firewall rules easily
Enable logging for monitoring

Installation

First update your system:

Code: Select all

apt update

Then install UFW:

Code: Select all

apt install ufw

Check status:

Code: Select all

ufw status

Output:

Code: Select all

Status: inactive

Basic Configuration

Set secure default policies:

Code: Select all

ufw default deny incoming
ufw default allow outgoing

This means:

Incoming traffic is blocked
Outgoing traffic is allowed

Important: Allow SSH First

Before enabling UFW, allow SSH access:

Code: Select all

ufw allow OpenSSH

or:

Code: Select all

ufw allow 22/tcp

If you skip this step, you may lock yourse…login to view the rest of this post