How to fix the error "Unable to open debugger port " in Android Studio?

Question

Error running Android Debugger (8600):
    Unable to open debugger port (localhost:8600):
    java.net.SocketException "Connection reset"

Answer 1

I was able to fix this with these commands:

• adb kill-server
• adb start-server

Answer 2

Try Restarting ANDROID STUDIO (Worked for me)

Answer 3

In my case, there was another service running on my laptop(Windows) that was using the port 8600. I opened Task Manager and stopped the service. Now, I could debug my application normally without the above error.

Answer 4

I solve the problem by checking my localhost.

Making sure 127.0.0.1 localhost.

Answer 5

For me this problem started when i upgraded my Android Studio to new version.

Please go to options menu Build and choose Clean Project.

That is it project started to run again and error was gone.

Answer 6

I tried other answers (e.g. restarting Android Studio) but they didn't solve this for me.

I had accidentally selected MTP (Media Transfer Protocol) in my Developer Options/USB Configuration. It started working once I set it to PTP (Picture Transfer Protocol).

EDIT: On reflection it's probably just that I changed the protocol because I've had the same issue since while on PTP. Hence I'm suggesting that the real answer is to change the protocol on the phone and, if you might need it, don't forget to change it back.

Answer 7

It could be that you need to wait for your code to stop compiling before you attached the debugger. I had a similar error and all I needed was patience.