First, we must edit the SSHD (SSH server daemon) configuration file. Use your favorite text editor.
Add the following code to the bottom of the configuration file. To go to bottom of the file just press “shift+g”.
# SSH Port
Port 9752 # the port you want to change
Next, we’ll update the firewall. If you have disabled the firewall, skip this step. My example uses port 9752. For CentOS 6 users, run these commands:
#iptables -I INPUT -p tcp –dport 9752 –syn -j ACCEPT
#service iptables save
#semanage port -a -t ssh_port_t -p tcp 9752
CentOS 7 users, run these commands instead:
#firewall-cmd –add-port 9752/tcp –permanent
#firewall-cmd –add-port 9752/tcp
The configuration changes are now finished. Restart the SSH service (SSHD)…
#service sshd restart