Microsoft pushes emergency repair for Home windows Server Hyper-V VM points

Windows Server

Microsoft has launched emergency out-of-band (OOB) Home windows Server updates to deal with a recognized subject breaking digital machine (VM) creation on Hyper-V hosts after putting in this month’s Patch Tuesday updates.

The problem impacts solely VMs managed with the System Middle Digital Machine Supervisor (SCVMM) and utilizing Software program Outlined Networking (SDN).

On affected programs, Home windows admins see warnings throughout dwell migration, SLB Load Balancer or SDN RAS Gateway fails, and expertise failures when creating new VMs and attaching Digital Community Interface Playing cards (VNICs).

Solely Home windows Server 2019 and Home windows Server 2022 ought to be impacted after putting in December 2022 Patch Tuesday updates (KB5021237 and KB5021249).

To resolve this subject, admins should set up the OOB cumulative updates launched right now for his or her programs on all affected Hyper-V hosts of their setting.

“You do not want to put in any replace or make any modifications to different servers or consumer gadgets in your setting to resolve this subject,” Microsoft said on Tuesday.

OOB updates not delivered through Home windows Replace

In the present day’s updates will not be delivered by Home windows Updates and won’t set up routinely on impacted servers.

To get the standalone package deal, you’ll have to seek for the KB quantity within the Microsoft Update Catalog, obtain them, and set up them manually.

They may also be manually imported into Home windows Server Replace Companies (WSUS) and Microsoft Endpoint Configuration Supervisor.

Microsoft additionally supplies directions on importing updates into WSUS and Configuration Manager from the Microsoft Replace Catalog.

The checklist of emergency Home windows Server cumulative updates launched right now consists of:

“You do not want to use any earlier replace earlier than putting in these cumulative updates,” Redmond added right now.

“If in case you have already put in updates launched December 13, 2022, you do not want to uninstall the affected updates earlier than putting in any later updates, together with the updates listed above.”

A temporary fix is also available for admins who can’t instantly set up right now’s updates on affected SDN-based SCVMM deployments.

This workaround requires working a set of instructions on all SCVMM-managed Hyper-V hosts from an elevated PowerShell window (instantly after putting in the KB5021237 and KB5021249 updates).

You’ll find scripts for large-scale deployments on the SCVMM Administration Server and additional particulars on making use of the workaround in this support article.

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