How to change the SSH port on Centos 7.x?

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Published Apr 27, 2025

Enhance your server security with this tutorial on changing the SSH port in CentOS 7.x. Elevate your server's defence—watch now!

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Commands:
Step 1: Log in to the server using the root user.
#ssh your_username@host_ip_address

Step 2: Take a backup of the current SSH configuration.
#date_format=`date +%Y_%m_%d:%H:%M:%S`
#sudo cp /etc/ssh/sshd_config /etc/ssh/sshd_config_$date_format
$ ls /etc/ssh/sshd_config*

Step 3: Open SSH new port on FirewallD.
#sudo firewall-cmd --add-port=3452/tcp --permanent
#sudo firewall-cmd --reload

Step 4: Change the SSH service port.
#sudo vi /etc/ssh/sshd_config

Step 5: Restart the service.
#sudo systemctl restart sshd

Command to connect VPS using the port number
#ssh your_username@host_ip_address -p port_number