Getting “error: closed” twice on “adb reverse”

Question

I am trying to reverse-forward port through ADB, but it just returns cryptic error of error: closed. Normal forwarding works. Session snippet:

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Answer 1

adb reverse requires Android 5.0+. For devices previous to that, you'll need to use a workaround like so.

If you have busybox installed on your Android device (most Genymotion images do), you can emulate adb reverse using this incantation:

adb shell busybox nc -ll -p {guest port} -e busybox nc {host IP} {host port}

In this case, "guest" is the Android OS running in the emulator and "host" is the computer running the emulator.