A few days ago, Microsoft began rolling out the May Cumulative Update, which is now available for all supported versions of the Windows operating system. It turned out that this update brings with it not only fixes, but also problems that are expressed in the disruption of the functioning of some platform services. The software giant has acknowledged the problem and will likely release a patch to fix the bugs soon.
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According to available data, we are talking about packages KB5013943 for Windows 11 (build 22000.675) and KB5013942 for Windows 10 (builds 19043.1706, 19042.1706 and 19041.1706). Installing the cumulative update may cause client and server OS authentication failures in a number of services, including Network Policy Server, Routing and Remote Access Service, Extensible Authentication Protocol, and Protected Extensible Authentication Protocol. According to the source, the issue is related to how the domain controller handles mapping certificates to user machine accounts. The issue does not affect non-domain-controlled client and server OS versions.
Microsoft is currently working on a patch that will fix the bugs mentioned. When exactly it will become available to users is still unknown. Users who encounter problems after installing the cumulative update are advised to manually map certificates to accounts in Active Directory.
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