Hi, With a non existing instance, e.g. a wrong key name or value, Xen_HostedService still return expected results below: wbemcli ain -ac Xen_HostedService http://root:password@localhost/root/virt:Xen_ResourcePoolConfigurationSer... wrong" localhost:5988/root/virt:Xen_HostSystem.CreationClassName="Xen_HostSystem",Name="zeit" wbemcli ain -ac Xen_HostedService http://root:password@localhost/root/virt:Xen_HostSystem.CreationClassName... wrong",Wrong="zeit" localhost:5988/root/virt:Xen_ResourcePoolConfigurationService.CreationClassName="Xen_ResourcePoolConfigurationService",Name="RPCS",SystemCreationClassName="Xen_HostSystem",SystemName="zei" localhost:5988/root/virt:Xen_VirtualSystemManagementService.CreationClassName="Xen_VirtualSystemManagementService",Name="Management Service",SystemCreationClassName="Xen_HostSystem",SystemName="zeit" localhost:5988/root/virt:Xen_VirtualSystemMigrationService.CreationClassName="Xen_VirtualSystemMigrationService",Name="MigrationService",SystemCreationClassName="",SystemName="" Also, some keys value of Xen_VirtualSystemMigrationService are NULL. I think it's maybe provider's fault, the same issue of Xen_HostedResourcePool and Xen_ResourceAllocationFromPool, which have been reported before. Please who can have a look into them? Thanks a lot! Best, Regards Daisy Guo Lian Yun E-mail: yunguol(a)cn.ibm.com IBM China Development Lab, Shanghai, China TEL: (86)-21-61008057