Unable to attach debugger in Android Studio - localhost:8600 java.net.ConnectException

Question

I cannot attach the debugger in Android Studio while running debug on a phone.

I’m currently using a Samsung S4, running Android 4.4.4 (but have tried an S5, S6, S7, and

Answer 1

At first i tried all the above ways, did not help. I have two computers with same settings. But at one worked at other error. It's given me an idea that it can be "hardware" problem. I switched USB to other slot with USB3.0 and used short cable and WOW it began work. I suggest there some delay in USB2.0 (polling), therefore process begin out of synch.