Improving Revit Server Stability Under High Load Conditions

Thanks to Michael Brian Lee in Autodesk QA for the following Revit Server information!

Some users with heavily loaded Revit Servers may experience periodic network disconnects and a lack of server availability. In the most severe cases Revit Server may become completely unresponsive and require a restart of the operating system itself. This issue is related to the underlying Windows Communication Foundation technology underpinning Revit Server, and generally manifests itself with one of the following symptoms:

• A message in the Windows Event Log with the following description:
  
  An error occurred while dispatching a duplicated socket: this handle is now leaked in the process.

• Exceptions in the Revit Server logs that resemble the following:
  
  System.ServiceModel.CommunicationException: There was an error reading from the pipe: The pipe has been ended. (109, 0x6d).
  --->System.IO.PipeException: There was an error reading from the pipe: The pipe has been ended. (109, 0x6d).
  at System.ServiceModel.Channels.PipeConnection.OnAsyncReadComplete(Boolean haveResult, Int32 error, Int32 numBytes)
  --- End of inner exception stack trace ---
  at System.ServiceModel.Channels.PipeConnection.EndRead()
  at System.ServiceModel.Channels.DelegatingConnection.EndRead()
  at System.ServiceModel.Channels.TracingConnection.EndRead()
  at System.ServiceModel.Channels.SessionConnectionReader.OnAsyncReadComplete(Object state)

Microsoft has issued a fix for this issue, and it can be downloaded here:

http://connect.microsoft.com/VisualStudio/Downloads/DownloadDetails.aspx?DownloadID=35626

We recommend that all users with heavily loaded Revit Servers download and install these updates.