Limit login to certain users over ssh

The default installation of ssh in ubuntu allows any user to login to the system over ssh. If you wish to restrict this, here is how:

Modify /etc/ssh/sshd_config. If you wished to allow only the users jhendrix, and svaughan to login via ssh, you could use the AllowUsers directive in your /etc/ssh/sshd_config file as such:

AllowUsers jhendrix svaughan

If you didn't mind all users logging in via ssh, with the exception of the users wgates, or sballmer then you could add the DenyUsers directive to your /etc/ssh/sshd_config in a similar manner, like this:

DenyUsers wgates sballmer

Of course, restart the server by typing:

sudo /etc/init.d/ssh restart

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