Hi, I can get any instance by ElementCapabilities associations with ManagementService, that is to say, below querying return NULL. wbemcli ain -ac LXC_ElementCapabilities 'http://root:password@localhost/root/virt:LXC_VirtualSystemManagementService.SystemCreationClassName="LXC_HostSystem",SystemName="nine",CreationClassName="LXC_VirtualSystemManagementService",Name="Management Service"' But LXC_ElementCapabilities associations with LXC_VirtualSystemMigrationService return expect result. wbemcli ain -ac LXC_ElementCapabilities 'http://root:password@localhost/root/virt:LXC_VirtualSystemMigrationService.SystemCreationClassName="LXC_HostSystem",SystemName="nine",CreationClassName="LXC_VirtualSystemMigrationService",Name="MigrationService"' localhost:5988/root/virt:LXC_VirtualSystemMigrationCapabilities.InstanceID="MigrationCapabilities" Best, Regards Daisy (运国莲) VSM Team, China Systems & Technology Labs (CSTL) E-mail: yunguol(a)cn.ibm.com TEL: (86)-21-60922144 Building 10, 399 Ke Yuan Rd, Pudong Shanghai, 201203