You can also open a specific port in the firewall to allow connections via it to a certain service. To block all SSH connections type the following command. If you are using custom SSH port (for example port 2222), then you need to open that port on UFW firewall using the following command. Let’s enable SSH connections to our server to stop that from happening using the following command: $ sudo ufw allow ssh If you’ve enabled UFW firewall by now, it would block all incoming connections and if you are connected to your server over SSH from a remote location, you will no longer able to connect it again. Then restart your firewall with the following commands: $ sudo ufw disable Then make sure “IPV6” is set to "yes" in the configuration file as shown. To verify it, open the UFW configuration file using your favorite editor. If your server is configured with IPv6, make sure that your UFW is configured with IPv6 and IPv4 support. $ sudo ufw app info 'Apache'ĭescription: Apache V2 is the next generation f the omnipresent Apache web server. If you want to get more information about a particular profile and defined rules you can use the following command. $ sudo ufw app listĭepending upon software package installations on your system the output will look similar to the following: Available applications: You can list all available application profiles on your server using the following command. When installing a software package using APT package manager, it will include an application profile in /etc/ufw/applications.d directory that defines the service and hold UFW settings. The default UFW firewall polices are placed in the /etc/default/ufw file and can be altered using the following command. This means, no one can access your server, unless you specifically open the port, while all the running services or applications on your server can be able to access the outside network. $ sudo ufw disableīy default, the UFW firewall denies every incoming connections and only allow all outbound connections to server. To disable UFW firewall, use the following command, which unloads the firewall and disables it from starting on boot. You can activate or enable UFW firewall using the following command, which should load the firewall and enables it to start on boot. On first install, the UFW firewall is disabled by default, the output will similar to below. Once the installation is completed you can check the status of UFW by typing. The UFW ( Uncomplicated Firewall) should be installed by default in Ubuntu and Debian, if not, install it using the APT package manager using following command. Install UFW Firewall on Ubuntu and Debian If you don’t have a sudo user, you can create one using the following instructions as root user. Prerequisitesīefore you begin with this article, make sure you have logged into your Ubuntu or Debian server with sudo user or with the root account. In this article, we will explain how to install and setup a UFW firewall on Ubuntu and Debian distributions. By default, Debian and Ubuntu distribution comes with a firewall configuration tool called UFW ( Uncomplicated Firewall), is a most popular and easy-to-use command line tool for configuring and managing a firewall on Ubuntu and Debian distributions. A correctly functioning firewall is the most crucial part of the complete Linux system security.
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