Windows 10, version 21H1

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Current status as of November 3, 2021
Windows 10, version 21H1 is designated for broad deployment. As always, we recommend that you update your devices to the latest version of Windows 10 as soon as possible to ensure that you can take advantage of the latest features and advanced protections from the latest security threats. For more details, see How to get the Windows 10 May 2021 Update

    Known issues

    This table offers a summary of current active issues and those issues that have been resolved in the last 30 days.

    SummaryOriginating updateStatusLast updated
    You might see authentication failures on the server or client for services
    Network Policy Server (NPS), Routing and Remote access Service (RRAS), Radius, and other services might fail.
    OS Build 19043.1706
    KB5013942
    2022-05-10
    Investigating
    2022-05-11
    19:12 PT
    Some apps using Direct3D 9 might have issues on certain GPUs
    You might have intermittent issues, apps might close unexpectedly, or you might receive an error.
    OS Build 19043.1682
    KB5011831
    2022-04-25
    Resolved
    2022-05-10
    15:49 PT

    Issue details

    May 2022

    You might see authentication failures on the server or client for services

    StatusOriginating updateHistory
    InvestigatingOS Build 19043.1706
    KB5013942
    2022-05-10
    Last updated: 2022-05-11, 19:12 PT
    Opened: 2022-05-11, 18:38 PT

    After installing updates released May 10, 2022 on your domain controllers, you might see authentication failures on the server or client for services such as Network Policy Server (NPS), Routing and Remote access Service (RRAS), Radius, Extensible Authentication Protocol (EAP), and Protected Extensible Authentication Protocol (PEAP). An issue has been found related to how the mapping of certificates to machine accounts is being handled by the domain controller.

    Note: Installation of updates released May 10, 2022, on client Windows devices and non-domain controller Windows Servers will not cause this issue. This issue only affects installation of May 10, 2022, updates installed on servers used as domain controllers.

    Workaround: The preferred mitigation for this issue is to manually map certificates to a machine account in Active Directory. For instructions, please see Certificate Mapping. Note: The instructions are the same for mapping certificates to user or machine accounts in Active Directory. If the preferred mitigation will not work in your environment, please see KB5014754—Certificate-based authentication changes on Windows domain controllers for other possible mitigations in the SChannel registry key section. Note: Any other mitigation except the preferred mitigations might lower or disable security hardening.

    Next steps: We are presently investigating and will provide an update in an upcoming release.

    Affected platforms:

    • ​Client: Windows 11, version 21H2; Windows 10, version 21H2; Windows 10, version 21H1; Windows 10, version 20H2; Windows 10, version 1909; Windows 10, version 1809; Windows 10 Enterprise LTSC 2019; Windows 10 Enterprise LTSC 2016; Windows 10, version 1607; Windows 10 Enterprise 2015 LTSB; Windows 8.1; Windows 7 SP1
    • ​Server: Windows Server 2022; Windows Server, version 20H2; Windows Server, version 1909; Windows Server, version 1809; Windows Server 2019; Windows Server 2016; Windows Server 2012 R2; Windows Server 2012; Windows Server 2008 R2 SP1; Windows Server 2008 SP2

    Some apps using Direct3D 9 might have issues on certain GPUs

    StatusOriginating updateHistory
    ResolvedOS Build 19043.1682
    KB5011831
    2022-04-25
    Resolved: 2022-05-10, 15:49 PT
    Opened: 2022-05-10, 09:41 PT

    After installing KB5011831, Windows devices using certain GPUs might have apps close unexpectedly or intermittent issues with some apps which use Direct3D 9. You might also receive an error in Event Log in Windows Logs/Applications with faulting module d3d9on12.dll and exception code 0xc0000094.

    Resolution: This issue is resolved using Known Issue Rollback (KIR). Please note that it might take up to 24 hours for the resolution to propagate automatically to consumer devices and non-managed business devices. Restarting your Windows device might help the resolution apply to your device faster. For enterprise-managed, devices that have installed an affected update and encountered this issue can resolve it by installing and configuring the special Group Policy listed below. For information on deploying and configuring these special Group Policies, please see How to use Group Policy to deploy a Known Issue Rollback.

    Group Policy downloads with Group Policy name:

    Important: You will need to install and configure Group Policies to resolve this issue. Please see, How to use Group Policy to deploy a Known Issue Rollback.

    Affected platforms:

    • ​Client: Windows 11, version 21H2; Windows 10, version 21H2; Windows 10, version 21H1; Windows 10, version 20H2
    • ​Server: None