Originally Posted by pershoot
To use adb, download new SDK/platform-tools so you can whitelist the connection (on tab).
To elaborate more on this, here is a post from the CyanogenMod team.
PSA - ADB Whitelist
As of the Android 4.2.2 update, when you connect your phone to a computer, you are presented with your computer's RSA key fingerprint to open the adb connection. You also have the ability to permanently trust the computer, so you don't have to repeat this step upon every re-connect.
In order for this to work, you must
be on the latest SDK which will grant you an updated 'adb' binary.
We will not
be introducing any functionality to sidestep this default security, so if you don't update, you will lose the ability to access the device using adb