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Step 1 : Login to your server as Root

Step 2 : Look for the sshd_config file (it can be found in /etc/ssh directory) and edit it

vim /etc/ssh/sshd_config

Step 3 : Search for a line that has :

Port 22

Step 4 : Amend the port number with something of your preference.

Note : You must ensure that the new port number is free and isn’t used by any other service.

Step 5 : Once you are sure about the changes, make sure that you Save the file

Step 6 : You may then restart sshd using the following command :

/etc/init.d/sshd restart

Step 7 : Make changes to the firewall with blocking Port 22 and allowing the new Port number used by SSH.

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