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Disable password login
Prevent SSH login by password so only login by SSH key is allowed, for security. Set this up on a remote machine that you plan to SSH to.
Only allow SSH login using known public keys rather than password-based. This is more secure especially on a public network or public server.
Edit the config file:
$ sudo vi /etc/ssh/sshd_config
Set these all to no
:
ChallengeResponseAuthentication no
PasswordAuthentication no
UsePAM no
PermitRootLogin no
Then reload:
$ /etc/init.d/ssh reload
Or
$ sudo systemctl reload ssh
Then try to access the machine. Note even if you only have one machine, you can SSH from a machine to itself.
$ ssh foo@bar
Force password login - expect an error.
$ ssh foo@bar -o PubkeyAuthentication=no