Security News > 2022 > December > Patch Tuesday updates spark errors when creating Hyper-V VMs

Updates to Windows Server that were included in Microsoft's Patch Tuesday batch of fixes this week could trip up users who want to spin up new virtual machines in some Hyper-V hosts.

The software giant is warning the problem can arise after installing the KB5021249 or KB5021237 updates on Windows Server or Azure Stack HCI hosts that are managed by System Center Virtual Machine Manager and are in software-defined networking-enabled environments with a network controller.

Windows administrators trying to create "a new Network Adapter joined to a VM network or a new Virtual Machine with a Network Adapter joined to a VM network" could see errors pop up, Microsoft engineers wrote in an update in the Windows Health Dashboard.

Windows admins may get messages warning about Ethernet connection errors when creating a new VM or network adapter on an existing VM, if an SDN software load balancer service fails, or if an SDN RAS Gateway service fails, according to Microsoft.

Existing VMs with existing network adapters won't have connection issues after installing the update, the company said.

Only new network adapters created after installing KB502129 will be affected.

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