IT Pro is supported by its audience. When you purchase through links on our site, we may earn an affiliate commission. Learn more

Windows Server admins say latest Patch Tuesday broke authentication policies

Microsoft has issued a workaround for the certificate-mapping issue, but many have already rolled back the updates to avoid operational disruption

IT administrators are reporting authentication issues after installing the most recent May 2022 Patch Tuesday security updates, released this week.

Online discussions suggest that a number of businesses are experience issues, specifically those that installed the updates on Windows Servers that also serve the domain controller (DC) and Active Directory Certificate Services (ACDS) roles.

According to some admins, Network Policy Server (NPS) policies were reported to be failing, returning an error which read that ‘authentication failed due to a user credential mismatch. Either the user name provided does not map to an existing account or the password was incorrect’.

Others said their Windows Server, which was serving only the DC role, not the ACDS role too, experienced the same issues with failing NPS policies. Removing the KB5013941 update reportedly fixed the issue.

One individual reported that in their environment they run separate servers for DC and NPS, and came to the conclusion that the NPS servers may be patchable, but DC servers may need to have the update rolled back, after testing the updates on each.

“FYI we're aware of the NPS issue,” said Steve Syfuhs, senior software engineer focusing on cryptography, authentication, and identity at Microsoft. “It's not related to NPS specifically but rather with how we're distinguishing between different kinds of names in the certificates. Only a subset of folks are affected by this.”

Syfuhs addressed users in a separate Twitter discussion and confirmed that Microsoft is looking into the issues that are being reported by numerous IT admins.

“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 said in an issues document. “An issue has been found related to how the mapping of certificates to machine accounts is being handled by the domain controller.”

The issues currently experienced by Windows Server administrators are due to the way in which Microsoft fixed two ‘high severity’ privilege escalation vulnerabilities, tracked as CVE-2022-26931 and CVE-2022-26923, in Tuesday's round of monthly security fixes.

Online discussions in the early hours after the security patches were released appeared to show users were able to apply the updates without issues, only for Windows Server issues to emerge later.

Related Resource

Securing endpoints amid new threats

Ensuring employees have the flexibility and security to work remotely

Whitepaper cover with image of female employee working at home on laptopFree Download

Earlier this year, many Windows Server administrators collectively agreed to forgo the security patches issued by Microsoft, citing numerous issues that led to operational disruption so severe that they thought they were better left unprotected from the security patches than to update and apply workarounds.

Microsoft has issued a recommended mitigation for admins who want a workaround to the issue with the certificates but do not want to roll back the latest update as others already have done, leaving themselves unprotected.

The workaround involves manually mapping certificates to a machine account in Active Directory, Microsoft said. If the recommended mitigation does not work, admins are encouraged to examine the related support document for other potential methods to resolve the issues they are experiencing.

Featured Resources

The state of Salesforce: Future of business

Three articles that look forward into the changing state of Salesforce and the future of business

Free Download

The mighty struggle to migrate SAP to the cloud may be over

A simplified and unified approach to delivering Enterprise Transformation in the cloud

Free Download

The business value of the transformative mainframe

Modernising on the mainframe

Free Download

The Total Economic Impact™ Of IBM FlashSystem

Cost savings and business benefits enabled by FlashSystem

Free Download

Recommended

Microsoft blocking Tutanota users from Teams registration, claims fix unfeasible
Business operations

Microsoft blocking Tutanota users from Teams registration, claims fix unfeasible

8 Aug 2022
Microsoft wins five-year digital transformation deal with Australia’s largest telco
digital transformation

Microsoft wins five-year digital transformation deal with Australia’s largest telco

26 Jul 2022
Slack Connect vs Microsoft Teams Connect: Better than email?
collaboration

Slack Connect vs Microsoft Teams Connect: Better than email?

20 Jul 2022
Microsoft announces simulator for autonomous aircraft development
Cloud

Microsoft announces simulator for autonomous aircraft development

20 Jul 2022

Most Popular

Cyber attack on software supplier causes "major outage" across the NHS
cyber attacks

Cyber attack on software supplier causes "major outage" across the NHS

8 Aug 2022
Why convenience is the biggest threat to your security
Sponsored

Why convenience is the biggest threat to your security

8 Aug 2022
Electrical explosion reported at Google's Iowa data centre
data centres

Electrical explosion reported at Google's Iowa data centre

9 Aug 2022