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Microsoft fixes Hyper-V network adapter issues in Windows Server with an out-of-band update

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A few days after the release of this month’s patch, Microsoft announced that the monthly security updates (KB5021249 and KB5021237) were causing problems on Windows Server 2022 and Windows Server 2019 systems, respectively. The issue was related to network adapters and NICs in Hyper-V environments. You can read about it in detail in this article.

Microsoft released out-of-band (OOB) updates today that resolve the issue. In the case of Windows Server 2022, it is KB5022553While for server 2019, it is KB5022554.

The update changelog notes the following improvements and fixes:


This non-security update includes quality improvements. When you install this KB:

This update addresses a known issue that affects Hyper-V hosts that use software-defined networking (SDN) and are managed by System Center Virtual Machine Manager (VMM). You may receive an error for workflows that include:

  • Creating a new network adapter for an existing virtual machine (VM) that is connected to the VM network
  • Create a new VM that has a network adapter that is connected to the VM network.

You can manually download and install the standalone packages from the Microsoft Update Catalog website:

Windows Server wasn’t the only platform affected by Patch Tuesday bugs as Windows 10 experienced hidparse BSODs.

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