Hello,
 I follow the steps describe to configure my TL-MR3040 V2.xxx

When i look to system log, ddserver is running.
When i connect my D800, in system log i've got message about detection of new high speed usb, and then a message saying that device not accepted adress x error -71.

I tried  with 2 differents cables and i reinit my TL-MR3040 to default and reflash  no change.

Any idea ?

Maybe you should ask the developer since this is quite technical. He has a forum on dslrdashboard.info

Thank. 
I will do it.