CentOS Linux 5/6: Change OpenSSH Port Number

To change the port number that OpenSSH listens on in CentOS Linux 5/6, you will need to edit the OpenSSH server configuration file.

1. Open the /etc/ssh/sshd_config file in a text editor.

sudo nano /etc/ssh/sshd_config

2. Locate the line that begins with Port and change the port number to the desired value. For example, to change the port to 2222:

Port 2222

3. Save and close the sshd_config file.

4. Restart the OpenSSH server to apply the changes:

sudo service sshd restart

5. If you are using a firewall, you will need to allow incoming connections on the new port.