May 2017 Description of the Quality Rollup for the .NET Framework 3.5.1 for Windows 7 SP1 and Windows Server 2008 R2 SP1 (KB4014596): May 16, 2017

July 18, 2017 This update is referenced in the July 2017 Preview of the Quality Rollups for the .NET Framework 3.5.1, 4.5.2, 4.6, 4.6.1, 4.6.2, and 4.7 for Windows 7 SP1 and Windows Server 2008 R2 SP1 that is dated July 18, 2017. This Quality Rollup contains no new updates.

View products that this article applies to.

This May 2017 update for Windows 7 Service Pack 1 (SP1) and Windows Server 2008 R2 SP1 includes cumulative reliability improvements in the .NET Framework 3.5.1. We recommend that you apply this update as part of your regular maintenance routines. Before you install this update, see the "Prerequisites" and "Restart requirement" sections.

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.

For ASP.NET

ASP.NET sequentially executes requests that have the same SessionID. This means that you may see the requests collecting in the queue if there are lots of concurrent requests that have the same SessionID. After you apply this fix, you can limit the number of the requests in the queue through the following appSettings entry:

<appSettings>
   <add key="aspnet:RequestQueueLimitPerSession" value="50"/>
</appSettings>

For CLR

If you arrange an array of struct A and an array of struct B as SAFEARRAY, and struct A and struct B have identical GUIDs, a memory leak may occur.

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

For more information about this security update as it relates to Windows 7 Service Pack 1 and Windows Server 2008 R2 Service Pack 1, see the following articles in the Microsoft Knowledge Base:

4019288 May 2017 Preview of the Quality Rollups for the .NET Framework 3.5.1, 4.5.2, 4.6, 4.6.1, and 4.6.2 for Windows 7 and Windows Server 2008 R2: May 16, 2017

4032113 July 2017 Preview of the Quality Rollups for the .NET Framework 3.5.1, 4.5.2, 4.6, 4.6.1, 4.6.2, and 4.7 for Windows 7 SP1 and Windows Server 2008 R2 SP1: July 18, 2017

Windows Update

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

Manual download

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

Prerequisites

To apply this update, you must have the .NET Framework 3.5.1 installed.

Restart requirement

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

File information

• Microsoft .NET Framework 3.5.1 when used with:
  • Windows Server 2008 R2 Service Pack 1
  • Windows 7 Service Pack 1