Error: "Power State Unknown" "CDS_EVENT_HOSTING_FAILED_POWER_ACTION" in XenDesktop

Machines in Desktop Studio or Desktop Director display a Power State of Unknown. CDSEVENTHOSTINGFAILEDPOWERACTION The Citrix Broker Service detected that power action '%1' on virtual machine '%2' failed. This problem is most likely due to a host issue. Check that the configuration of the virtual...