01 Oct, 2022

Problems such as boot loops and Hyper-V not starting on Windows Server. Caused by Windows Update in January 2022 [Update 2: Fixed]

Windows Update

Released on January 12, 2022 ・Installing the update program for Windows Server distributed on WindowsUpdate reports bugs such as falling into a boot loop, Hyper-V not starting, and ReFS volumes becoming inaccessible. is out.

Update history 1. Microsoft acknowledged the "boot loop" and "Hyper-V does not start" bugs. Added a note at the bottom of the article. "Bootloop" and "Hyper-V does not start" were added and revised. [2022/1/14] ② An update program that fixes this bug has been urgently released. Added that to the bottom of the article. [2022/1/18] [New]

Bug in Windows Server

Released on January 12, 2022 After installing the distributed security update program, the following problems may occur in the Windows Server environment.

Bootloop

Windows Server may reboot unexpectedly after installing the January 12, 2022 update on a domain controller. After Windows starts, it may restart itself in a continuous boot loop after a few minutes.

Bootloop or Hyper- Bugs such as V not starting up.Caused by Windows Update in January 2022 [Update 2: Fix]

Windows Server 2016 or later may be affected by this bug when using Shadow Principals in an environment where the domain controller uses Enhanced Security Admin Environment (ESAE) or Privileged Identity Management (PIM). is higher.

This problem may occur in the following OS environments.

Hyper-V won't start

A Hyper-V virtual machine may not start. At that time, the following message is displayed along with the error.

'XXX' failed to start. Virtual machine 'XXX' could not be started because the hypervisor is not running.

This problem may occur in the following OS environments.

ReFS file system is inaccessible

Windows Resilient File System (ReFS) volumes may become inaccessible.

OS and update programs that may cause problems

These problems may occur in an OS environment where the following update programs are installed.

Solution/Workaround

You can temporarily avoid this problem by uninstalling the update program. If you are having trouble, please try uninstalling the update by executing the following command from the command prompt or Windows PowerShell.

Because these updates are security updates, it is important to note that uninstalling them will leave vulnerabilities unfixed.

Update 1: Microsoft acknowledges bug [2022/1/14]

Microsoft announced on January 13, 2022 (local time) that "Bootloop" and "Hyper-V I acknowledged the problem that it does not start. At this time, Microsoft has not announced a workaround for the problem. Therefore, if the above problem occurs, there is currently no other option but to uninstall the update program.

Currently, Microsoft is investigating this issue and plans to provide an update later.

Update 2: Fix [2022/1/18] [New]

An update that fixes this bug has been urgently released. See the article below for details.

Microsoft urgently releases KB5010793 and KB5010795. Fixed a bug that could not connect to VPN and a bug of Windows Server

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