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Searches all log files (including archived bzip2 files) for invalid user and PAM authentication errors, both of which are indicative of brute force attempts at logging into computer. A list of all unique IP addresses and domain names is appended to hosts.deny. The command (and grep error messages) will work on Mac OS X 10.6, small adjustments may be needed for other OSs.
There is 1 alternative - vote for the best!
I use iptables. To rate limit connections. Very easy and no ban lists to manage.
If you can do better, submit your command here.
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