android studio can't connect to debug devices

Question

Android Studio can't connect to debug devices.

When I click the debug button, the debug tab shows me

Connecting to the target VM, address: 'localhost:8600', transport: 'socket'

in variables

When I tried again it told me

12:14:44 Error running Android Debugger (8600): Unable to open debugger port : java.io.IOException "handshake failed - connection prematurely closed"

and then debug tab show me this

 Disconnected from the target VM, address: 'localhost:8600', transport: 'socket'

in variables

My Android Studio version is 0.4.4 #AI133-1005886

This problem has been haunting me for a long time.

i use OS X

Answer 1

in android studio: tools->android->enable adb integration(this should be checked) uncheck this, then check again. this solved me this problem. (it restarts the adb integration)