The failed backups or configuration attempts are associated with connection errors between the DMA and the NDMP Server The control connection is the initial connection from the DMA to the NDMP Server....The failed backups or configuration attempts are associated with connection errors between the DMA and the NDMP Server The control connection is the initial connection from the DMA to the NDMP Server. The data connection is the connection from the NDMP Server back to the DMA, used to send the NDMP data stream over the network. The NDMP hostname or IP address in the DMA configuration corresponds to either a data LIF, or a LIF using a custom service policy.