Enable Pre-Login Message
Should you wish to display a warning message at the SSH prompt of your server, follow these instructions:
Login to your server:
sudo vi /etc/ssh/sshd_config
uncommment this line
#Banner /etc/issue.net
add this line to end of file
AllowUsers username
sudo vi /etc/issue.net
enter your warning message. re:
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W A R N I N G
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THIS IS A PRIVATE COMPUTER SYSTEM.