First published on TECHNET on Dec 21, 2018
When Windows update ‘KB4467684‘, ‘KB4478877‘, ‘KB4471321‘ or ‘KB4483229’ is installed on a VMM managed Windows Server 2016 host, VMM is not able to enumerate or manage the Logical Switch deployed on the host. Customers will notice the following symptoms when they open the ‘Virtual Switches’ property of the Host.
The above-mentioned updates are unregistering the following WMI classes used by VMMAgent to enumerate and manage Logical Switch deployed to the Host.
WMI Class | MOF File |
Scvmm_VirtualEthernetSwitchInternalSettingData | Scvmmswitchportsettings.mof |
Scvmm_EthernetSwitchPortInternalSettingData | |
Scvmm_VirtualEthernetSwitchHyperVNetworkVirtualizationSettingData | |
Msvm_EthernetSwitchPortSCVMMSettingData | |
Msvmm_DhcpV4PortClientOptionsInfo | VMMDHCPSvr.mof |
Msvmm_DhcpV4PortBindingOptionsPolicy | |
Msvmm_DhcpV4PortReservationPolicy | |
Msvmm_DhcpV4PortPolicy | |
Msvmm_DhcpV4PortInfo |
Running the following PowerShell on the affected host fetches zero objects.
Get-CimClass -Namespace root/virtualization/v2 -classname *vmm*
Note: Running the same PowerShell on a host which does not have these updates installed, fetches VMM related classes.
Use mofcomp to add the VMM related classes and class instances to the WMI repository. On the affected host, run the following commands
Mofcomp “%systemdrive%\Program Files\Microsoft System Center 2016\Virtual Machine Manager\setup\scvmmswitchportsettings.mof” Mofcomp “%systemdrive%\Program Files\Microsoft System Center 2016\Virtual Machine Manager\DHCPServerExtension\VMMDHCPSvr.mof”
%systemdrive%\Program Files\Microsoft System Center\Virtual Machine Manager\setup\scvmmswitchportsettings.mof %systemdrive%\Program Files\Microsoft System Center\Virtual Machine Manager\DHCPServerExtension\VMMDHCPSvr.mof
Get-VMSwitchExtension -VMSwitch $VMSwitch | Format-Table Name, Enabled Name Enabled ---- ------- Microsoft Windows Filtering Platform False Microsoft VMM DHCPv4 Server Switch Extension False Microsoft Azure VFP Switch Extension True Microsoft NDIS Capture False
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