Event ID 18121 — VMMS
Updated: April 7, 2009
Applies To: Windows Server 2008
This is preliminary documentation and subject to change.
The Virtual Machine Management Service (Vmms.exe) is the service that uses WMI to perform Virtual System Management related operations in Hyper-V and the Hyper-V Manager.
|Product:||Windows Operating System|
|Message:||Failed to import unknown device '%1'.|
Check export and import settings
Check the environment (including the configuration settings of any virtual machines involved in this operation) and retry the operation. If the vmms service has stopped running, restart the vmms service.
The virtual machine configuration information is contained in the vsconfig.dll file. By default the vsconfig.dll file is installed at \\windows\system32.
To restart VMMS:
1. In the Hyper-V Manager click the server on which you want to stop the service, then click Action, then click Stop Service.
2. Click Action, then click Start Service.
You can use the restart services PowrShell cmdlet to restart VMMS. On the computer that has the stopped service, open a command prompt as local administrator and type the following:
Check that the VMMS service is in the running state in the Service Control Manager and that the failed operation now succeeds.