Adding a simple banner when you ssh into the machine

If you would like to display a simple message when users ssh into a machine, then you will have to edit the /etc/issue.net file and add your display message such as

$sudo vi /etc/issue.net
#################################################
#####   All connections are monitored and recorded         #####
#Disconnect IMMEDIATELY if you are not an authorized user!#
#################################################

After you add your custom message, you can turn on the banner in /etc/ssh/sshd_config file and enable the banner

$sudo vi /etc/ssh/sshd_config

************
# no default banner path
#Banner none
Banner /etc/issue.net
************

Next, restart sshd process

$sudo /etc/init.d/sshd restart
Stopping sshd:                                             [  OK  ]
Starting sshd:                                               [  OK  ]

Now when you log out and log back in you will see your banner getting displayed.