The storage unit's network connection of the storage unit as defined has failed. Once you acknowledge the message, you are returned to the configuration wizard. First reenter the host and IP address values and try the connection again. If needed, check the physical devices connecting the storage unit to the network. Also try other network testing commands available to you, such as ping, to check the address and status of the storage unit or your network configuration in general.
Use the wizard to reenter the IP and host name, check physical network connections and try again.