title: Nexus 4 does not show the RSA dialog when connecting USB in debug mode
body: <p>I did the factory reset, and my computer is newly installed.
  I enabled the USB debuging, and connect to the computer. It shows the drivers are installed successfully, and i can see so in the device manager.
  But the phone does not show the RSA dialog to comfirm the connection, and in the DDMS, it is offline...
  My nexus is official android 4.2.2
  Has anyone met this issue? Please give advice! thanks!</p>
  
  <p>/<strong><em>*</em>****</strong><em>Update</em><strong><em>*</em>**<em>*</em></strong>/
  I tried on my office computer. When connected to the office computer, the dialog, which shows the RSA key fingerprint, pops up. But as i tried this on my home computer, no dialog and merely the notifications on the bar.</p>