September 11, 2018—KB4457142 (OS Build 16299.665)

Improvements and fixes

This update includes quality improvements. No new operating system features are being introduced in this update. Key changes include:

Security updates to Internet Explorer, Microsoft Edge, Microsoft scripting engine, Windows graphics, Windows media, Windows Shell, Windows cryptography, Windows virtualization and kernel, Windows datacenter networking, Windows hyper-V, Windows Linux, Windows kernel, Microsoft JET Database Engine, Windows MSXML, and Windows Server.

If you installed earlier updates, only the new fixes in this package will be downloaded and installed on your device.

For more information about the resolved security vulnerabilities, see the Security Update Guide.

Known issues in this update

Symptom	Workaround
After installing this update, some users that are using VPN with IKEv2 may fail to establish a VPN connection. The connection fails with the error, “Remote Access Error 809.”	This issue is resolved in KB4464217.
After installing this update, Windows no longer recognizes the Personal Information exchange (PFX) certificate that’s used for authenticating to a Wi-Fi or VPN connection. As a result, Microsoft Intune takes a long time to deliver user profiles because it doesn’t recognize that the required certificate is on the device.	This issue is resolved in KB4464217.
All Guest Virtual Machines running Unicast NLB fail to respond to NLB requests after the Virtual Machines restart.	This issue is resolved in KB4457136.
After you install the August Preview of Quality Rollup or September 11, 2018 .NET Framework update, instantiation of SqlConnection can throw an exception. For more information about this issue, see the following article in the Microsoft Knowledge Base: 4470809 SqlConnection instantiation exception on .NET 4.6 and later after August-September 2018 .NET Framework updates	This issue is resolved in KB4480967.

How to get this update

This update will be downloaded and installed automatically from Windows Update. To get the standalone package for this update, go to the Microsoft Update Catalog website.

File information

For a list of files provided in this update, download the file information for cumulative update 4457142.