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Reasons like....what, exactly? We're a hosting company and we use them on most servers. They're not perfect, but they prevent probably about 95% of the automated attacks that we see come through. If it's enough protection to make them move on to something easier, it's better than nothing. I agree with you that they're pretty easy to bypass, and shame on companies like Barracuda Networks who sell Supermicro servers with CentOS and mod_security and a proxy set up with a fancy web interface and call that a "web application firewall", but they ARE better than nothing.

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