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server gets DOS just by scanning him

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linux-howto

http://serverfault.com – ubuntu 12.4 LTS, apache 2.2.14, mysql+wordpress on top. server gets into serious load 70.0 69.9 67.0 just by scanning it with web application scanning tool, and becomes unresponsive. Easy DOS from single host so to speak. How to prevent this? (HowTos)