Monthly security updates (KB 5021249 and KB 5021237) for Hyper-V hosts released on Dec 13th, 2022, have known issues that impacts SCVMM managed SDN (Software Defined Networking) deployments and this creates failures with new VM creation and virtual network assignment.
Impacted scenarios:
If your infrastructure meets all the following criteria, then it is impacted; Please apply the fix shared below after patching.
- SCVMM managed Hyper-V hosts (Azure Stack HCI clusters, Windows Server 2019, Windows Server 2022) patched with KB 5021249 and KB 5021237 update.
- SCVMM version 2019 or SCVMM version 2022 configured with Network Controller.
Impacted environments:
|
S.no. |
VMM version |
Hyper-V patched with KB 5021249 or KB 5021237 |
SDN Enabled |
Impacted |
|
1 |
VMM 2016 |
- |
- |
No |
|
2 |
VMM 2019 |
2012 R2, 2016, 2019, HCI 21H2 |
No |
No |
|
3 |
VMM 2019 |
2012 R2, 2016 |
Yes |
No |
|
4 |
VMM 2019 |
2019, HCI 21H2 |
Yes |
Yes |
|
5 |
VMM 2022 |
2016, 2019, 2022, HCI 22H2 |
No |
No |
|
6 |
VMM 2022 |
2016 |
Yes |
No |
|
7 |
VMM 2022 |
2019, 2022, HCI 22H2 |
Yes |
Yes |
Issues:
If you don’t apply the solution after patching the Hyper-V hosts with KB 5021249 and KB 5021237, the following could occur:
- New VM creation fails: Creating a new VM with Network adapter fails.
- SLB Load Balancer or SDN RAS Gateway fails with an ‘EthernetConnection’ error
- Attaching vNIC fails: Attaching a Network adapter to an existing VM .
- Warning message during live migration: Live migration of Non-Highly Available VMs completes with ‘EthernetConnection’ warning message.
An error message like the one below is seen in these scenarios:
Solution:
If you encountered the above issues, after patching SCVMM managed Hyper -V hosts with KB 5021249 and KB 5021237, we recommend installing the appropriate Cumulative update from below on all SCVMM managed Hosts.
If you haven’t patched SCVMM managed Hyper-V hosts with ‘KB 5021249 and KB 5021237’ updates, we recommend skipping the updates ‘KB 5021249 and KB 5021237’ and manually install the following Cumulative updates on all SCVMM managed Hosts.
Cumulative updates:
- Windows Server 2022: KB5022553 – Link to download the KB from Microsoft Update Catalog
- Windows Server 2019: KB5022554 – Link to download the KB from Microsoft Update Catalog
Note:
The above updates are not available from Windows Update and will not be installed automatically.
You can manually import these updates into Windows Server Update Services (WSUS) and Microsoft Endpoint Configuration Manager. For WSUS instructions, see WSUS and the Catalog Site. For Configuration Manger instructions, see Import updates from the Microsoft Update Catalog.
For additional details and Frequently Asked Questions please refer to this KB article. If you need further help with this, please contact the Microsoft Support team by creating a support request.