See who’s poking your Linux box | Tips4Linux.com
by oseres
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
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