The Remote Control dialog in the console does not establish remote connection when specifying the client's hostname. If the client's actual ip address is specified, the connection is successful. You will notice that when the hostname is specified, the wrong IP address is resolved for the connection attempt.
Unable to attach to specified device.
Stale client IP data in server's Database. An issue was identified with the Basic Inventory function of the Symantec Management Agent where under certain circumstances, the Agent would not acknowledge that the ip address of the client had changed and therefore not update the server with the correct information.