SSH: How To Set SSH Warning Banner

In ssh configuration, there is provision to mention Warning banner that would display to client before establish connection to SSH Server. Let's see below to implement it.

We need to edit /etc/ssh/sshd_config and mention Banner derivatives.

#grep Banner /etc/ssh/sshd_config

Banner /etc/ssh/banner

Above mention file should contain Warning message as below

#cat /etc/ssh/banner

#######################################################################

###                     Welcome to Info                             ###

###                                                                 ###

###             All connections are monitored and recorded          ###

###                                                                 ###

###     Disconnect IMMEDIATELY if you are not an authorized user    ###

###                                                                 ###

#######################################################################

Let's see how it would show while user trying to connect SSH Server.

#ssh qts.infosolutiontechnology.com

#cat /etc/ssh/banner

#######################################################################

###                     Welcome to Info                             ###

###                                                                 ###

###             All connections are monitored and recorded          ###

###                                                                 ###

###     Disconnect IMMEDIATELY if you are not an authorized user    ###

###                                                                 ###

#######################################################################

root@qts.infosolutiontechnology.com's password: 

Last login: Wed April 12 19:20:51 2017 from 192.168.0.101

root@qts ~#

So now whenever any user try to connect through SSH, he/she will see this warning banner