How Android solves the failure of connecting a TV set-top box

Today in the development process, the need to connect Hamidi TV box, this box is based on the android6.0 version, previously connected to other TV boxes are normal, when the input adb-s xxxx shell, the box connection failed, the log is as follows:

Error:device Unauthorized.
This ADB server ' s $ADB _vendor_keys are not set
Try ' adb kill-server ' if that seems wrong.
Otherwise Check for a confirmation dialog on your device.

Log display, not authorized, the first reflection is not the developer option is not open, through the Query TV box Advanced selection, sure enough to find not open, the key is to test the other several TV boxes before, there is no manual to set this option.

Find out why, the solution is simple:

How Android solves the failure of connecting a TV set-top box