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KB941633 - FIX: Error message when you run a client application that is built on the .NET Framework 2.0: "The request was cancelled. An underlying connection that was expected to be open was closed"
NOTE: This hotfix applies to .NET Framework 2.0 with no Service Pack. .NET Framework 2.0SP2 and .NET Framework 3.5SP1 already contain the functionality this hotfix provides.