Reassociated WFP context in same flow doesn't work in Windows

This article describes an issue that occurs when a context is associated with a data flow in Windows Server 2012 R2, Windows 8.1, Windows RT 8.1, Windows Server 2012, or Windows Embedded 8. You can fix this issue by using the update in this article. Before you install this update, see the Prerequisites section.

Symptoms

For Windows Filtering Platform (WFP) callouts that process data at a filtering layer that supports data flows, the callout driver can associate a context with each data flow. WFP callouts that associate context with data flows may not be able to correctly inspect traffic because of a problem in how WFP handles the callout driver allocated context.

How to get this update

Important If you install a language pack after you install this update, you must reinstall this update. Therefore, we recommend that you install any language packs that you need before you install this update. For more information, see Add language packs to Windows.

Method 1: Windows Update

This update is provided as a Recommended update on Windows Update. For more information on how to run Windows Update, see How to get an update through Windows Update.

Method 2: Microsoft Download Center

The following files are available for download from the Microsoft Download Center:
Operating systemUpdate
All supported x86-based versions of Windows 8.1Download Download the package now.
All supported x64-based versions of Windows 8.1 Download Download the package now.
All supported x64-based versions of Windows Server 2012 R2Download Download the package now.
All supported x64-based versions of Windows Server 2012Download Download the package now.
Note The update for Windows RT 8.1 can be downloaded only from Windows Update.

For more information about how to download Microsoft support files, click the following article number to view the article in the Microsoft Knowledge Base:
119591 How to obtain Microsoft support files from online services
Microsoft scanned this file for viruses. Microsoft used the most current virus-detection software that was available on the date that the file was posted. The file is stored on security-enhanced servers that help prevent any unauthorized changes to the file.

Update detail information

Prerequisites

To apply this update in Windows 8.1 or Windows Server 2012 R2, you must have April 2014 update rollup for Windows RT 8.1, Windows 8.1, and Windows Server 2012 R2 (2919355) installed.

Registry information

To apply this update, you don't have to make any changes to the registry.

Restart requirement

You may have to restart the computer after you apply this update.

Update replacement information

This update doesn't replace a previously released update.

Status

Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.

References

Learn about the terminology that Microsoft uses to describe software updates.

File Information

The English (United States) version of this software update installs files that have the attributes that are listed in the following tables.
Windows 8.1, Windows RT 8.1 and Windows Server 2012 R2
Windows Embedded 8 and Windows Server 2012
Additional file information
Properties

Article ID: 3123242 - Last Review: Mar 8, 2016 - Revision: 1

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