![]() ![]() Step 4: Allow SSH Connectionsīefore you enable UFW, you need to allow SSH access on your server by adding a rule that will allow incoming SSH connections. In the next step, we’ll learn how to allow specific connections. So, in most cases, you cannot set your firewall to block all incoming connections. Keep in mind that servers usually need to respond to an incoming request from Internet users. To set these UFW rules to the default, you can run the following commands: sudo ufw default deny incoming If you want to check or change the default policies, you can find them in the /etc/default/ufw configuration file. In other words, all of the connections that will try to access your server will be refused and all of your applications and services that are locally found on your server will be able to reach the outside world and access other servers. By default, UFW is configured to deny all incoming connections and allow all outgoing connections. The first thing you need to know is the default policies. If you already have UFW activated on your server, the output will look quite different and will look similar to the following: Output:ĭefault: deny (incoming), allow (outgoing), disabled (routed) UFW by default is initially disabled, and if you never activated before you will get the output: Output Once the installation is complete, you can check the UFW status with the command: sudo ufw status verbose UFW should be already installed by default on Ubuntu 18.04 – but if for some reason is is not installed, you can install it with this command: sudo apt install ufw Once logged in, make sure that your server is up-to-date by running the following commands: sudo apt update Of course, you will need to replace IP_Address and Port_Number with your actual server IP address and SSH port number. To do this, use the following command: ssh IP_Address -p Port_Number Step 1: Connect to Your Serverīefore we begin, you’ll need to connect to your server via SSH as root or user with sudo privileges. To follow this tutorial, you will need a server with Ubuntu 18.04 and SSH access with the root user (or a user with sudo privileges). Step 6: Allow Connections on Specific Ports.If you are using Ubuntu 18.04 and want to secure your network without having to deal with learning how to use iptables, then UFW may be the appropriate solution you are looking for. To simplify the process of creating firewall rules, Canonical (the creators of Ubuntu) developed an iptables interface called Uncomplicated Firewall (UFW). Additionally ‘iptables’ – a firewall utility accessible from the command line – is also part of the Netfilter framework. Almost all modern Linux firewall solutions use this system to filter network packets. In regards to the Linux kernel, a Netfilter subsystem is implemented, which is used to manipulate the network traffic. ![]() First, we will take a moment to introduce and explain what firewalls are, and then we’ll show you how to use UFW and how to make the appropriate UFW configuration.Ī firewall is a software program that monitors the network traffic and prevents unauthorized access to or from a private network. ![]() In this article, we will show you how to install and configure UFW on an Ubuntu 18.04 VPS. ![]()
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