Why is XP Detection Signature not consistantly tripping?

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Why is XP Detection Signature not consistantly tripping?

Hello,

We have created a custom vulnerability signature to detect XP devices based on identifying the user agent string as described in  Custom vulnerability signature for identifying Windows XP clients .   The issue we are encountering is that the signature by default has an action of alert but in the vulnerability profile there is an exception response of reset-client. The issue we encountering is that the signature action is inconsistant.  We are seeing threat log entries with the action of alert as opposed to the anticipated action of reset-client.  Any ideas what might be causing this behavior?

Any ideas or thoughts would be appreciated.

Phil  

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