DNZREL103E: (Usage Error) The host provided is not a valid host for this operation.\n \n Hints:: \n To add the host to the farm :: \n 1. make sure that the host is discovered properly and is not a member of some other virtual farm.\n 2. For Xen host, make sure that extended discovery is completed.\n 3. For VMWare VirtualCenter, Make sure that extended discovery is completed and Security -> Connect access is provided. \n To remove the host from the virtual farm :: \n check that the host exists in this virtual farm.