If you are using WHM & CSF, under CentOS, you may follow this steps to change SSH port from 22 (default) to something else .

1.First we must allow incoming data in the new port. Open your WHM >> Plugins >> CSF.

2. Click “Firewall Configuration” button.

3. Add your new port in “TCP_IN” and “TCP_OUT”.

4. Click “Change” button in the bottom of the page.

5. You will be asked to restart CSF & LFD. Do it.

6. Next, edit this file

/etc/ssh/sshd_config

• You can use vi

vi /etc/ssh/sshd_config

7. Find this line

#Port 22

Change to your chosen port, and remove the comment ( # sign )

Port 9999

8. Restart the SSH service from WHM : Restart Services > SSH Server (OpenSSH), or with this command :

service sshd reload

9. It’s done

10. Optional steps : remove port 22 from CSF > Firewall Configuration > TCP_IN & TCP_OUT

• Source : xrvel