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Qualys Scans Affecting DNS or Firewall

Question asked by John Snyder on Mar 21, 2013
Latest reply on Mar 21, 2013 by djprakash

Our enterprise experiences routine outages in which applications cannot access their db counterparts when a scan is running. We've seemed to narrow it down to the affects being on DNS which gives the impression that DNS is down, or at least unaccessible. Has anybody else experienced this, and if so, a remedy or setting that we should be aware of when scanning so that there is not an affect on applications. I was under the impression that scans could run with little or no performance degradation or impact to my enterprise. Also, it's not confirmed that it is directly affecting DNS, but access to DNS as there is evidence to a large/rapid jump in traffic on the firewall.