The November 2016 Preview of Monthly Quality Rollup for Windows Server 2012 includes cumulative improvements in reliability in the .NET Framework 4.6 and the .NET Framework 4.6.1. We recommend that you apply this quality rollup as part of your regular maintenance routines. Before you install this update, see the "Prerequisites" and "Restart requirement" sections.

Quality and reliability improvements

ADO.NET issue resolved

Exceptions may be thrown in SqlClient during the prelogin handshake process or during MARS communication when a received TDS packet size is smaller than expected. Prelogin handshake errors will manifest as an OverflowException, and MARS errors will manifest as a generic "Physical connection is not usable" exception.

Note This update also contains cumulative updates that were released previously starting from October 11, 2016.

CLR issue resolved

When an application uses unaligned block initialization, such as from managed C++, the code generated on AVX2 hardware has an error. If the JIT uses a register other than xmm0 for the source, this error causes an incorrect encoding to be used.

WPF issue resolved

Assume that a Windows Presentation Foundation (WPF) application includes a D3DImage control. You start the application, change both the size and the content of the image, and then run the image through software rendering. For example, you run the application through Remote Desktop. In this situation, memory leak occurs.

More Information

How to get this update

Method 1:

This update is available from Windows Update, as an Optional update.

Method 2:

To get the stand-alone package for this update, go to the Microsoft Update Catalog website.


To apply this update, you must have the .NET Framework 4.6 or 4.6.1 installed, as appropriate.

Restart requirement

You have to restart the computer after you apply this update if any affected files are being used. We recommend that you close all .NET Framework-based applications before you apply this update.

Applies to

This article applies to the following operating system:

  • Windows Server 2012, when used with the following .NET Framework versions:

    • The .NET Framework 4.6

    • The .NET Framework 4.6.1

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