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I've tried enabling SSH logins in my linux server. It can establish connection just fine trough my private key. I also went to /etc/ssh/ssh_config and edited the following field like this:

PasswordAuthentication no

But it still lets me login trough a username/password when I use putty or winSCP. Right now I can login both from user/password and SSH keys, which is rather pointless as far as security goes. What else do I need to do to ONLY allow SSH logins?

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    You are editing the wrong file. SSH server config is under /etc/ssh/sshd_config – Henrik Pingel Dec 4 '15 at 9:19
  • ah yes, my bad. I also had to change these 2 options: PasswordAuthentication no ChallengeResponseAuthentication no and restart the server – jonnybravo Dec 4 '15 at 9:27
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You need to modify different file /etc/ssh/sshd_config and you need to disable also ChallengeResponseAuthentication like this:

ChallengeResponseAuthentication no
PasswordAuthentication no

and restart the service.

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