Full error (wall of) text:
Unable to cast COM object of type 'System._ComObject' to interface type 'System.Management.IWbemServices'. This operation failed because the QueryInterface call on the COM component for the interface with IID '{9556DC99-828C-11CF-A37E-00AA003240C7}' failed due to the following error: The object invoked has disconnected from its clients. (Exception from HRESULT: 0x80010108 (RPC_E_DISCONNECTED)).
Scenario:
I have a two node Hyper-V failover cluster using a HA scale out file server as VM storage. When I attempt to create a virtual machine (through the failover cluster MMC) I get the error. If I attempt to do the same through the regular Hyper-V management console
I do not get the error. Also, I only get the error when creating the VM on the 1st node. This started happening after I rebooted the first node to get delegated permissions set on the SOFS share. Turns out a reboot was unnecessary because the 2nd node wasn't
rebooted and works just fine. But something during the reboot @#$!ed the first node between FC console and Hyper-V management.
Searches for the error turn up mostly programming sources; nothing about hyper-v or FC.