See who’s poking your Linux box

Posted by Cypress on Jul 22, 2009 7:28 PM EDT
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If you’re using SSH and you have your ports wide open to the world, your best bet would be to install fail2ban. If you’re curious though as of whom is trying to get in by bruteforcing your SSH passwords, you might get a clear view with the following command: grep “POSSIBLE BREAK-IN ATTEMPT” /var/log/auth.log This will verbose a list detailing each break-in attempt that has been made, with the exact date, hour, minute and second of it. It will also display the point of origin of these attempts, in a fashion similar to this one:

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