To Change the SSH Port for Your Linux Server Connect to your server via SSH (more info). Switch to the root user (more info). Run the following command: vi /etc/ssh/sshd_config Locate the following line: # Port 22 Remove # and change 22 to your desired port number. Restart the sshd service by running the following command: . . . Read more

Sometimes you need to open a port on your server, you want it to be recheable only from specific IP address, you can use Iptables for this: iptables -I INPUT -p tcp -s 118.70.15.19 –dport 22 -j ACCEPT In that case, you are opening ssh port only to IP 10.1.1.2, . . . Read more