What Is Windows 10 21h2 Update

Posted on  by admin

I am unable to install windows updates to my PC which is currently running 21H1. I cannot install the latest cumulative update to 21H1, nor can I install 21H2 directly using the media creation tool (tried both running from the desktop and a bootable USB drive).

I have done various searches and as a result of advice found (mostly on answers.microsfot.com) tried the windows update trouble shooter, the media creation tool (as previously mentioned), and various commands in windows power shell to check integrity, find and fix problems etc etc. I had exactly the same issue over a year ago with a previous update (I think it was 20H1) that after several hours on the phone to Microsoft support ended up in me having to re-install windows 10 from scratch (as opposed to doing an upgrade install or just installing windows updates as and when they appear).

The support case would have been under my previous email address as I recently changed it, but all other details are the same.

How to get this update

  • I would like to try to update to windows 11, but am very reluctant given the issues I'm having.
  • I have extracted the latest log by running "Get-WindowsUpdateLog" in power shell, but don't see a way to attach it to this message.
  • My PC now keeps trying to install updates, rebooting and then reverting back.
  • The last time the error code was 0xc1900101 when trying to install KB5009467, which I've seen several times before and used to find the details on fixes that have not so far worked for me.
  • Find information on known issues and the status of the rollout for Windows 10, version 21H2.


Looking for a specific issue? Press CTRL + F (or Command + F if you are using a Mac) and enter your search term(s). Want the latest Windows release health updates? Follow @WindowsUpdate on Twitter. Windows 10, version 21H2 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 November 2021 Update. If you are using Windows 10 and want to move to Windows 11, you can check if your device is eligible for the upgrade using the PC Health Check app or checking Windows 11 specs, features, and computer requirements.

Windows 10 transitioned to annual release cadence

Note that you also need to be running Windows 10, version 2004 or later, have no safeguard holds applied to your device, and have a Microsoft Account (MSA) if using Home edition. For more information on the Windows 11 upgrade experience, watch our video, Windows 11 Upgrade Experience.

This table offers a summary of current active issues and those issues that have been resolved in the last 30 days. You might see authentication failures on the server or client for services.

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.

Issue details

​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.

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