This article describes the reliability rollup 3179948 for the Microsoft .NET Framework on Windows 8.1 and Windows Server 2012 R2. This update includes cumulative improvements in reliability in the .NET Framework 4.6 and 4.6.1. 

Specifically, this update contains a cumulative account of all limited distribution release (LDR) updates that have been shipped to date. No new features are introduced in this update. This update provides important reliability improvements in the following .NET Framework components, among others:

  • Common Language Runtime

  • Windows Forms

  • Windows Presentation Foundation

  • Windows Communication Foundation


See the prerequisites for applying this update.

More Information

How to obtain this update

Method 1:

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

Method 2:

To obtain 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.

Command-line switches for this update

For information about the various command-line switches that are supported by this update, visit Command-Line Options on the MSDN website.

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.

Update removal information

To remove this update, use the Add or Remove Programs item or the Programs and Features item in Control Panel.

File information

For a list of the files that are provided in this reliability update, download the file information for reliability update 3179948:

Download Download the x86 package file information now.

Download Download the x64 package file information now.

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