Microsoft Fixes Hyper-V VM Issue Caused by Patchday • The Register

Microsoft has released an emergency fix for an issue in Windows Server caused by patch updates that made it impossible for some organizations to create virtual machines on Hyper-V hosts.

The issue emerged after Windows Server 2019 and Windows Server 2022 users installed two updates that were part of this month’s Patchday releases. Some found that they could not create VMs for hosts managed by System Center Virtual Machine Manager (SCVMM) that leverage Software-Defined Networking (SDN) technologies.

Microsoft engineers first created an enterprise workaround and a week later released an out-of-band (OOB) fix that users can apply to all of their Hyper-V systems that use SDN and SCVMM to troubleshoot issues across the board fix network.

“You do not need to install an update or make any changes to other servers or client devices in your environment to fix this issue,” Microsoft wrote in its Windows Health Dashboard.

The issue appeared after users installed updates KB5021249 and KB5021237 on Windows Server or Azure Stack HCI hosts. When attempting to create a new VM or a new network adapter on an existing one, some users could not get network connections, SDN software load balancers, or SDN gateway services.

Initially, Microsoft offered them a workaround that involved using an elevated PowerShell window on the affected hosts. Now organizations can get a self-contained package for the OOB updates by searching the Microsoft Update Catalog for the KB update number and manually importing it into Windows Server Update Services (WSUS), with instructions available here, and Endpoint Configuration Manager (with instructions here). .

Customers must manually install the updates that are not automatically installed. The cumulative update for Windows Server 2019 is KB5022554; for Windows Server 2022 it is KB5022553.

“You do not have to apply a previous update before installing these cumulative updates,” Microsoft wrote. “If you have already installed updates released on December 13, 2022, you do not need to uninstall the affected updates before installing later updates, including the updates listed.”

The Patchday updates have caused some headaches for Windows users. Earlier this week, Microsoft warned about one of the cumulative updates – KB5021233 – that some people using different versions of Windows 10 systems ran into the dreaded Blue Screen of Death when starting the operating system.

The software maker said it is working on a fix for the problem and has introduced a workaround in the meantime. ® Microsoft Fixes Hyper-V VM Issue Caused by Patchday • The Register

Rick Schindler

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