If you want to change the ssh server port for any reason namely security (extremely recommended), From the default port which is 22 .You can use any other port but above 1024 is preferable.
To change the port on the server, First make a copy :
cp -p /etc/ssh/sshd_config /etc/ssh/sshd_config.orig.$(date +%F)
Then change the port to … for example 2222 :
nano /etc/ssh/sshd_config
Unmark the #port 22 to port 2222
Also allow it through the SElinux :
semanage port -a -t ssh_port_t -p tcp 2222
Note: if you get “semanage command unknown” you should install the tool with YUM, this will add the option :
yum install policycoreutils-python
Now add the port to the firewall rules:
firewall-cmd --zone=public --add-port=2222/tcp --permanent
List all rules to make sure you did good :
firewall-cmd --list-all
Reload the firewall to apply the rules:
firewall-cmd --reload
Restart SSH to apply the changes:
systemctl restart sshd
Good Luck