July 18, 2017 - This update is referenced in the July 2017 Preview of the Quality Rollups for the .NET Framework 3.5, 4.5.2, 4.6, 4.6.1, 4.6.2, and 4.7 for Windows 8.1, Windows Server 2012 R2, and Windows RT 8.1 that is dated July 18, 2017. This Quality Rollup contains no new updates.
This May 2017 update for Windows 8.1 and Windows Server 2012 R2 includes cumulative reliability improvements in the .NET Framework 3.5. 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.
- All updates for Windows RT 8.1, Windows 8.1, and Windows Server 2012 R2 require update 2919355 to be installed. We recommend that you install update 2919355 on your Windows RT 8.1-based, Windows 8.1-based, or Windows Server 2012 R2-based computer so that you receive updates in the future.
- 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.
Quality and reliability improvements
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>
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 from October 11, 2016.
Additional information about this security update
For more information about this security update as it relates to Windows 8.1 and Windows Server 2012 R2, see the following articles in the Microsoft Knowledge Base:
4019290 May 2017 Preview of the Quality Rollup for the .NET Framework 3.5, 4.5.2, 4.6, 4.6.1, and 4.6.2 updates for Windows 8.1 and Windows Server 2012 R2: May 16, 2017
4032115 July 2017 Preview of the Quality Rollups for the .NET Framework 3.5, 4.5.2, 4.6, 4.6.1, 4.6.2, and 4.7 for Windows 8.1, Windows Server 2012 R2, and Windows RT 8.1: July 18, 2017
How to get this update
This update is available from Windows Update as an optional update.
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 3.5 installed.
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.