


You want to check Always allow from this computer and tap OK. This will place computer RSA public key on your device into /data/misc/adb/adb_keys folder and allow all subsequent connections. When you connecting to local computer using USB cable for the first time your Android 4.2+ device will prompt you if you want to allow connection. This is due security improvements which require you to whitelist all computers on your Android device before they can execute any of ADB commands.

If you are using Android 4.2+ device you need to have ADB version 1.0.31 or greater. Now its time to connect to local computer for the first time.

Now go to Settings -> Developer Options and enable USB debugging.
