As we all know that opening ssh for all users is not good foe security reasons.
So to deny ssh access for certain users we have to
Just edit sshd_config located under /etc/ssh/ (location can be different depending upon version of linux )
Add the line
DenyUsers username1 username2
save and exit
then restart the service
# /etc/init.d/sshd restart
Now the users username1 and username2 will be denied.
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