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Microsoft Releases Emergency Fix for Hyper-V VM Problems

On Tuesday, December 20, Microsoft released an emergency patch to fix problems caused by updates released the previous week in December’s Patch Tuesday. Some users reported being unable to create virtual machines on Hyper-V hosts.

Resolution: This issue was resolved in out-of-band (OOB) updates released December 20, 2022 for installation on all Hyper-V hosts in your environment which are using Software Defined Networking (SDN) and managed by System Center Virtual Machine Manager (SCVMM). You do not need to install any update or make any changes to other servers or client devices in your environment to resolve this issue. – Microsoft Windows Health Dashboard

Only Windows Server 2019 and Windows Server 2022 should be impacted after installing December 2022 Patch Tuesday updates (KB5021237 and KB5021249).

The updates were released December 13th, you don’t need to roll these back to get the fix, simply install KB5022553 / KB5022554 on top of that update. Prioritize systems using SDN managed by SCVMM, then schedule updating your other Hyper-V installations for consistency.

For the scripts for large-scale deployments on the SCVMM Management Server and further details on applying the workaround, refer to this support article: Win12B issue in System Center Virtual Machine Manager


Software Defined Networking (SDN) managed by SCVMM might have issues with new VMs

Alex Lim is a certified IT Technical Support Architect with over 15 years of experience in designing, implementing, and troubleshooting complex IT systems and networks. He has worked for leading IT companies, such as Microsoft, IBM, and Cisco, providing technical support and solutions to clients across various industries and sectors. Alex has a bachelor’s degree in computer science from the National University of Singapore and a master’s degree in information security from the Massachusetts Institute of Technology. He is also the author of several best-selling books on IT technical support, such as The IT Technical Support Handbook and Troubleshooting IT Systems and Networks. Alex lives in Bandar, Johore, Malaysia with his wife and two chilrdren. You can reach him at [email protected] or follow him on Website | Twitter | Facebook

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