Nexus 5 (Kitkat 4.4) won't authorize my Windows 8 computer

Question

I'm trying to do some app development for Android with Eclipse and my Nexus 5.

However, after the first time loading MyFirstApp from Eclipse, I can't seem to get the authorization right.

When I run adb devices from the command prompt, I end up getting

0350b965215d9854               unauthorized

or

0350b965215d9854               offline

and even after restarting everything, I only sporadically get the authorization popup on my phone. Even if I select 'always allow from this computer' checkbox (pic below), my computer remains unauthorized. I have never had it remember authorizing my computer as the checkbox would suggest.

A few times, after killing the server and restarting the server multiple times, adb will recognize the device, as after typing "adb devices", I get

0350b965215d9854            device

But if I try running the app in eclipse I'll get the following error message.

[2013-11-09 18:10:16 - MyFirstApp] Failed to install MyFirstApp.apk on device '0350b965215d9854': timeout
[2013-11-09 18:10:16 - MyFirstApp] Launch canceled!

I'm also unable to run shell or other commands from adb.

I've verified I'm using the latest usb drivers, android sdk, and eclipse release and have tried the following fixes:

On Nexus 5:

• Booting in Safe mode

  Toggling/untoggling USB Debugging

  Revoking USB debugging authorization and reauthorizing

  Restarting the phone

  Allowing permissions on a one-time basis

On Windows 8:

• Restarting the computer

  Restarting Eclipse

  Killing/starting adb from cmd

  Killing adb from task manager

  Reinstalling Eclipse

  Reinstalling google's USB drivers

  Installing the nexus 5 line in google's drivers as per this question

  Reinstalling the Android SDK

  Changing USB Ports

I've seen very similar posts for the Nexus 4 and Nexus 7, but after trying everything contained in those solutions, I'm still not getting anywhere.

Answer 1

Here's my solution
1. I re-download the latest ADT bundle
2. uninstall the old driver in "My Computer" -> "Device Manager" (delete the old driver also)
3. Right click on "Nexus 5" and update the driver using the one under "[New ADT Path]/sdk/extra/google/usb_driver"
4. Turn on debug mode (click on KRT16M multi-times)
5. Deploy my first app . And a popup on device appears. Click "Yes" to accept the key.

Good luck!

Answer 2

Have you tried updating both the SDK and ADT ? Support for Kitkat is provided in the latests ADT