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

This problem was driving me crazy for about 2 weeks. What finally fixed it for me was changing "auto" to "java" in the debugger process selection window like this: