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We are seeing tens of Connection_Abandoned_By_ReqQueue errors in HTTPERR file every day (and once that day) fired in quick succession for our ASP.NET WebAPI application running in IIS 7. We think there is a connection between those and timeouts we are seeing in our HTTP client for this service.

We wonder whether those connection abandonments (that actually happens throughout whole day, separated by few minutes) originates in client stops responding, or whether it's the server process that freezes, fails to respond and gets cleaned at the end of the day.

Is it possible that a HTTP client that goes silent and not ACK returned data makes IIS wait for such a long time before some cleaning manifests itself by Connection_Abandoned_By_ReqQueue log message?

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