Hello, can You provide a security function that request for something (second level authentication) before sign in my server? I mean so its harder to get in..
i think it might be possible using Googles two factor authentication software for Linux: http://xmodulo.com/two-factor-authentication-ssh-login-linux.html
Or option be, setup SSH key access instead of password:
A) https://support.hostgator.com/articles/specialized-help/technical/ssh-keying-through-putty-on-windows-or-linux
B) http://www.ualberta.ca/CNS/RESEARCH/LinuxClusters/pka-putty.html
One can also edit /etc/ssh/sshd_config file
and change ones port number to something non-standard like "789", save and "service sshd restart" to apply changes
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