I have a Nexus 4 with Android 4.3 and I am trying to connect the device to a computer with Windows 7 64bit.
I installed the latest drivers and the latest adb>
My resolution was running adb devices from the command prompt, pathed to the adb application. For example C:\Android\platform-tools\adb devices . Running this command returned the following * daemon not running. starting it now on port 5037 *
*daemon started successfully *
I then saw the device listed as unauthorized, unplugges the USB, plugged back in and was prompted for the RSA fingerprint.