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Windows 10, version 1909 and Windows Server, version 1909
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|Summary||Originating update||Status||Last 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 18363.2274|
You might see authentication failures on the server or client for services
|Status||Originating update||History||Resolved||OS Build 18363.2274|
|Resolved: 2022-05-27, 14:07 PT
Opened: 2022-05-11, 18:38 PT
Resolution guidance updated May 27, 2022
After installing updates released May 10, 2022 on your domain controllers, you might see machine certificate 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.
Resolution: This issue was resolved in out-of-band updates released May 19, 2022 for installation on all Domain Controllers in your environment, as well as all intermediary application servers such as Network Policy Servers (NPS), RADIUS, Certification Authority (CA), or web servers which passes the authentication certificate from the client being authenticated to the authenticating DC. If you used any workaround or mitigations for this issue, they are no longer needed, and we recommend you remove them. This includes the removal of the registry key (CertificateMappingMethods = 0x1F) documented in the SChannel registry key section of KB5014754. There is no action needed on the client side to resolve this authentication issue.
To get the standalone package for these out-of-band updates, search for the KB number in the Microsoft Update Catalog. You can manually import these updates into Windows Server Update Services (WSUS) and Microsoft Endpoint Configuration Manager. For WSUS instructions, see WSUS and the Catalog Site. For Configuration Manger instructions, see Import updates from the Microsoft Update Catalog. Note The below updates are not available from Windows Update and will not install automatically.
- Windows Server 2022: KB5015013
- Windows Server, version 20H2: KB5015020
- Windows Server 2019: KB5015018
- Windows Server 2016: KB5015019
Note: You do not need to apply any previous update before installing these cumulative updates. If you have already installed updates released May 10, 2022, you do not need to uninstall the affected updates before installing any later updates including the updates listed above.
- Windows Server 2012 R2: KB5014986
- Windows Server 2012: KB5014991
- Windows Server 2008 R2 SP1: KB5014987
- Windows Server 2008 SP2: KB5014990
Note: If you are using security only updates for these versions of Windows Server, you only need to install these standalone updates for the month of May 2022. Security only updates are not cumulative, and you will also need to install all previous Security only updates to be fully up to date. Monthly rollup updates are cumulative and include security and all quality updates. If you are using Monthly rollup updates, you will need to install both the standalone updates listed above to resolve this issue, and install the Monthly rollups released May 10, 2022 to receive the quality updates for May 2022. If you have already installed updates released May 10, 2022, you do not need to uninstall the affected updates before installing any later updates including the updates listed above.
- 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