Secure Shell or SSH is a network protocol that allows users to access servers remotely. This protocol also encrypts communication between servers to make it even more secure. Unfortunately, using standard Transmission Control Protocol (TCP) port 22 for SSH may be risky as it is vulnerable to various cyber attacks, especially brute-force attacks. Brute-force attacks are methods hackers use to gain access to encrypted confidential data. So, it’s best to change the default SSH port because this is a method to protect your SSH server. This article will teach you how to change SSH listening port on Ubuntu 24.04.
OpenSSH
How To Harden OpenSSH on Ubuntu 20.04
OpenSSH is one of the most popular tools that uses SSH protocol for secure system administration, file transfers, and other communication across the Internet. It is free and used by system administrators to manage remote systems. OpenSSH runs on port 22 and it is the first target of a hacker. So you may need to harden your OpenSSH server to protect it from hackers.