In an advisory on the issue, Microsoft said: “After installing the May 10, 2022 update on your domain controller, you may see Network Policy Server (NPS), Routing and Authentication failures for services such as Remote Access Service (RRAS), Radius, Extensible Authentication Protocol (EAP), and Protected Extensible Authentication Protocol (PEAP). An issue has been identified with how domain controllers handle the mapping of certificates to machine accounts “.
The company noted that the issue only affects servers that have the May 10, 2022 Update installed and act as domain controllers. any on the clientWindowsPeople installing updates on devices and non-domain controller Windows servers shouldn’t experience the same problem.
Microsoft shares list of 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
While Microsoft hasn’t said when there will be a fix, the company said it’s “currently investigating and will provide an update in an upcoming release.”
At the same time, Microsoft also provides a temporary solution:
The preferred mitigation for this problem is to manually map the certificate to the machine account in Active Directory. For instructions, seecertificate mapping. Note: The instructions are the same for mapping certificates to user or machine accounts in Active Directory.
If the preferred mitigations do not work in your environment, seeKB5014754 – Certificate-based authentication changes on Windows domain controllersfor other possible mitigations in the Schannel registry keys section. Note: Any other mitigations other than the preferred mitigations may reduce or disable security hardening.
