Procedure to change OpenSSH pre login banner
1) By default sshd server turns off this feature.
2) Login as the root user; create your login banner file:
# vi /etc/ssh/sshd-banner
Append text:
Welcome to XYZ Remote Login!
3) Open sshd configuration file /etc/sshd/sshd_config using a text editor:
# vi /etc/sshd/sshd_config
4) Add/edit the following line:
Banner /etc/ssh/sshd-banner
5) Save file and restart the sshd server:
# /etc/init.d/sshd restart
6) Test your new banner (from Linux or UNIX workstation or use any other ssh client)
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Post login message display:
Edit the file /etc/motd.