![]() If you’re running UFW firewall and need to allow traffic to the new port, use the command below. ![]() Ubuntu has UFW firewall installed by default. You’ll need to use the -p option to instruct the client to use some other port than the default 22. To make sure everything is working, you can try to SSH on the new port.Save the changes you’ve made to this file and exit.For this example, we’ll switch the port number to 2222. We’ll need to uncomment this line and change the number to our desired port number. Start by opening the /etc/ssh/sshd_config configuration file with nano or your preferred text editor.Open a command line terminal and follow along with the steps below to configure the SSH port on Ubuntu and other Debian based systems, as well as CentOS and other Red Hat based systems. How to change SSH port on Ubuntu and CentOS Linux.CentOS is based on Red Hat, so its instructions can also be extended to Fedora and other similar Linux distributions. Since Ubuntu is based on Debian, you can also apply the same instructions to other Debian based systems, like Linux Mint. In this article, we’ll take you through the step by step instructions of changing the default SSH port on Ubuntu Linux and CentOS Linux. In practice, this means that the thousands of bots scanning the internet for open SSH servers are a lot less likely to find yours. Changing the SSH port would fall under “security through obscurity” which means that the security isn’t technically enhanced, but the SSH port has been obscured and isn’t as easy for attackers to access. ![]() If multiple servers share the same IP address (behind a NAT configuration, for example) you usually can’t have them running SSH on the same port and expect to access them from outside the network. There are a few reasons why you may want to change this to some other number. ![]() The default port for SSH on Linux systems is 22. ![]()
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