Microsoft releases an urgent patch to fix authentication errors on Windows Server

Microsoft has just released an out-of-band (urgent update) update to fix authentication errors related to Kerberos authorization scenarios affecting Domain Controllers (DCs) running versions of Windows. Servers are supported.

On affected systems, users cannot sign in to services or applications using Single Sign-On (SSO) in on-premises Active Directory or hybrid Azure Active Directory environments.

This issue affects systems running Windows Server 2019 and lower versions, including Windows Server 2016, Windows Server 2012 R2, Windows Server 2012, Windows Server 2008 R2 SP1, and Windows Server 2008 SP2.

Microsoft releases an urgent patch to fix authentication errors on Windows Server Picture 1 Microsoft releases an urgent patch to fix authentication errors on Windows Server Picture 1

According to Microsoft, it was the security update released on November 9 that caused the Kerberos authentication problem. Therefore, an urgent update was released to quickly resolve the issue.

If you are using one of the above versions of Windows Server, you can download the emergency update by following the links below:

Usually you won't be able to download and install emergency updates via Windows Update. The emergency updates in this article also do not automatically install on affected systems.

You can find, download, and install emergency updates on the Microsoft Update Catalog page. For this article, TipsMake.com has provided download links for each update and you just need to click to download it.