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I used to use a linux software that monitors logs like http, ssh, etc and if it detects that someone is trying to use brute force, it blocks that ip by adding a rule to iptables. I forgot what that software is called. It's opensource and free.

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up vote 6 down vote accepted

fail2ban does that, although I don't think it's the only such tool. (Amazed mentioned DenyHosts, although it seems to be SSH specific.)

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Thank you! that was the one I was thinking of. –  David Apr 18 '11 at 15:47
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If that's the answer you needed, good etiquette here is to mark it as the accepted answer. –  Caleb Apr 18 '11 at 16:14
    
There's also denyhosts –  Andrew Lambert Apr 18 '11 at 23:58
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