Microsoft’s May Patch Tuesday Updates Cause Windows AD Authentication Errors

Microsoft’s May Patch Tuesday update is triggering authentication errors.

Microsoft is alerting customers that its May Patch Tuesday update is causing authentications errors and failures tied to Windows Active Directory Domain Services. In a Friday update, Microsoft said it was investigating the issue.

The warning comes amid shared reports of multiple services and policies failing after installing the security update. “Authentication failed due to a user credentials mismatch. Either the user name provided does not map to an existing account or the password was incorrect.”  posted an admin to a Reddit thread on the topic.

According to Microsoft, the issue has been caused after installing the updates released on May 10, 2022.

“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),” Microsoft reported.

“An issue has been found related to how the mapping of certificates to machine accounts is being handled by the domain controller,” Microsoft added.

The domain controller is a server that is responsible for responding to

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