System.IO.IOException: Pipe is broken

Question

Starting Dec 21st we started seeing a tremendous amount of errors on both our Server Infrastructure and Endpoint devices. This created issues with certain .NET related applications on end users workstations that required restarting various applications. One application particularly troublesome was Mimecast For Outlook. Upon investigating we found that the only resolution to fix these errors was to completely remove Sophos (obviously that's not a solution nor a risk we're willing to take). 
 
 Sample Errors - 
 28-12-2020 09:07:41,964 ERROR [12] HOST: Domain Unhandled Exception: System.IO.IOException: The pipe is being closed.

 at System.IO.__Error.WinIOError(Int32 errorCode, String maybeFullPath)
 at System.IO.Pipes.NamedPipeServerStream.BeginWaitForConnection(AsyncCallback callback, Object state)
 at System.IO.Pipes.NamedPipeServerStream.WaitForConnection()
 at Mimecast.Mapi.Remote.NamedPipesServer.AcceptPipeConnection(IAsyncResult asyncResult)
 at System.IO.Pipes.NamedPipeServerStream.AsyncWaitForConnectionCallback(UInt32 errorCode, UInt32 numBytes, NativeOverlapped* pOverlapped)
 at System.Threading._IOCompletionCallback.PerformIOCompletionCallback(UInt32 errorCode, UInt32 numBytes, NativeOverlapped* pOVERLAP). IsTerminating: True (Program) 
 Message=Application: msddsk.exe
Framework Version: v4.0.30319
Description: The process was terminated due to an unhandled exception.
Exception Info: System.IO.IOException
 at System.IO.__Error.WinIOError(Int32, System.String)
 at System.IO.Pipes.PipeStream.WinIOError(Int32)
 at System.IO.Pipes.NamedPipeServerStream.GetImpersonationUserName()
 at Mimecast.Mapi.Remote.NamedPipesServer.AcceptPipeConnection(System.IAsyncResult)
 at System.IO.Pipes.NamedPipeServerStream.AsyncWaitForConnectionCallback(UInt32, UInt32, System.Threading.NativeOverlapped*)
 at System.Threading._IOCompletionCallback.PerformIOCompletionCallback(UInt32, UInt32, System.Threading.NativeOverlapped*) 
 Is anyone else seeing this? We'll certainly open a Ticket with support but wanted to also understand the scope.

Paul Haley · Accepted Answer

Thanks. Yes i have had this confirmation (below) that it is now fixed, I have asked for clarification about why they ask to disable controlled update. My PC must have already updated and the Mimecast issue now fixed. I suggest you test your other apps that have been affected after applying the update. 
 The reported issue has been addressed from backend by sophos . MTR query pack has been updated on next update you will receive it. (please disable control update in central if enabled ) Now you should perform sophos update and check whether .net / Mimecast is crashing or not on system

System.IO.IOException: Pipe is broken

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