Changing default SSH port can be one of the steps to improve security in Linux servers. By changing SSH port to something other than port 22 and using a proper firewall you may have a good result on minimizing brute-force attacks to SSH.
To change SSH listening port you are required to edit /etc/ssh/sshd_config file. You may use nano, vi or any other text editor you like based on the Linux distro you are using.
change the Line “ Port 22 “ to whatever you want and restart the SSHD service. make sure the line is not commented otherwise your changes won’t be counted. It is also required to change your firewall setting and allow connections to your desired port through your firewall.
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