I got a call yesterday from a customer that is having trouble with a Qualys
Guard scan. Apparently it scans systems for vulnerabilities but when it
comes to a port that has a PHP server on it (in this case Zend Server), it
starts sending over 1000 transactions a second at it, so it becomes a DOS
attack. Qualys firmly denies doing a DOS but I can't understand why the
burst of transactions. Any thoughts?


Jim Oberholtzer

Chief Technical Architect

Agile Technology Architects

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