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I'm getting the following intermittent errors related to querying AD using DirectorySearcher.FindOne() or FindAll() . System.OverflowException: Arithmetic operation resulted in an overflow. at System.DirectoryServices.SearchResultCollection.ResultsEnumerator.GetCurrentResult() at System.DirectoryServices.SearchResultCollection.ResultsEnumerator.get_Current() at System.DirectoryServices.SearchResultCollection.ResultsEnumerator.System.Collections.IEnumerator.get_Current() This is happening in a web app and seems to happen after the app has been running for several hours. This is a documented issue on Microsoft Connect but it looks like it has been marked as "not reproducible" and closed. The only fix that I found here is to recycle the app pool periodically which is a rather harsh workaround and not viable when your users are in the middle of working. Has anyone experienced this and if so how was this resolved? I have tried to use caching but this just delays the inevitable until you hit a certain threshold in terms of the number of AD calls since people have reported that each time the API call is made it leaks memory . Any help would be much appreciated.

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