Simple trick to add more security with ssh configuration.

3.    change the port in the file /etc/ssh/sshd_config and make following changes firstly unhash the port entry & change the port number to 2222:

vi /etc/ssh/sshd_config
Port 2222
---------------------------------------
[root@kalwa1 ~]# cat /etc/ssh/sshd_config|grep -i port
Port 2222

4.    Now restart the sshd service to take affect the changes we made in the ssh configuration in the above steps.

[root@kalwa1 ~]# service sshd restart
Stopping sshd:                                             [  OK  ]
Starting sshd:                                             [  OK  ]
[root@kalwa1 ~]#

5.    Now if you try to connect with default port it won’t connect.  System gives connection refused error as below:

[root@kalwa1 ~]# ssh manmohan@192.168.216.130
ssh: connect to host 192.168.216.130 port 22: Connection refused
[root@kalwa1 ~]#