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ASA 5510 - CSC TrendMicro Anti-X (DNS Issues?)

Our primary DNS was taken down for maintenance. Secondary DNS was still up. Noticed a really bad latency accessing the web. Some sites would time out and others wouldn't load correctly. The CSC module shares the same DNS as all of the other devices on our network. It was not until we made the secondary DNS in trend micro (Our backup DNS) the primary one, that we saw normality. Does anyone have any thoughts on this. I'm eager to know.

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