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

I am using a real device. Simply deleting the app on the device, and then running from Android Studio solved this issue.

It seems Android Studio had trouble with overwriting the file that was already on the phone.