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I'm setting up a server for backing up my desktop box remotely. I want to prevent remote password access to the server, permitting only users with private keys (AKA my desktop box) to access it. How can I block remote password access while allowing physical password access to the server?

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2 Answers 2

up vote 21 down vote accepted

Just insert the following to the sshd config on the server (/etc/ssh/sshd_config)

PasswordAuthentication no

That should do the trick ;)

For more options type man sshd_config in to your terminal.

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See this thread for more hints: ubuntu.stackexchange.com/questions/2271/… –  LassePoulsen Aug 15 '10 at 21:51

Just a note about SSH access to servers - you may also want to disable the root user from ssh - http://www.howtogeek.com/howto/linux/security-tip-disable-root-ssh-login-on-linux/ - this way at least hackers will have to guess the username as well.

PermitRootLogin no
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+1 for sane advice! Never login as root!! –  jathanism Aug 11 '10 at 23:54

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