[SOLVED] The Mac App Store and the ” MZFinance.NoGUIDTokenFailureKey_message ” Error

If you are awake today then you know that the Mac App Store launched (run software update to get it, requires a restart). Upon installing and restarting my machine, I tried to get Twitter for Mac. Yet I cannot sign into the Mac App Store — instead I get this error: MZFinance.NoGUIDTokenFailureKey_message

This issue is not documented anywhere that I can find at this time, except for this discussion thread I started in the Apple Forums.

There is rampant speculation as to what the problem is, but first here is what I have tried:

  • Restarting the Mac
  • A secondary Apple ID
  • Re-installing 10.6.6
  • Installing the 10.6.6 combo updater
  • Dumping ~Library/Cache and User/Library/Cache
  • Dumping all plist and files related to the App Store in Library/Application Support
  • Updating all credit card and billing info on the account.
  • Updating apps in iOS so that I can accept the new user terms of service.

Here are some things I have learned about this problem:

  • People who have used a cloned drive to setup a new computer seem to be experiencing this problem the most.
  • Users with this problem report other Macs working with their login.
  • Speculation is that the Hardware UUID for people who used a clone on a new machine, or migration assistant is not reporting correctly, causing this problem.


See below.

[Updated: 1/6/11 at 9:39 AM]
Just got off the phone with AppleCare — they are looking into to the issue now and are currently at a loss. They will be calling me back in a few hours, I will update with any new news as it comes in.

[Updated: 1/6/11 at 1:49 PM]
I have heard back from AppleCare and they had me fill out a general form inputting the error code. The Rep I spoke with said that Apple feels confident that the error is on their end, not mine. This step could take well over 48 hours as I must wait for responses. If this step fails I was told there are other options, but these options are more “invasive”. I am not sure what that means, but it can’t be good.

[Updated: 1/6/11 at 10:01 PM]
AppleCare wanted me to try resetting the home folder and user ACLs using the re-installation disc. I did that with no success. I will let you know if I find anything else. Major bummer.


[Updated: 1/7/11 at 10:18 AM]

AppleCare found the solution and it is rather simple. Now this solution has worked for me, but there is no guaranty that it will work for you.

Solution: Go to Macintosh HD (or whatever you call your HD in Finder) > Library > Preferences > SystemConfiguration

For there look for the file labeled: “NetworkInterfaces.plist”

You need to move this file to the Trash, but do not delete it (an Administrator password will be needed for this). Before you restart your computer be sure you have network passwords and settings at hand, you will need this. If you have that reboot the machine and connect to your network.

That is it. If the problem you had was the same as mine, this will solve the issue. If you are still having problems please contact Apple to work with them on the issue.

Please email me if this does, or does not work for you. Good Luck!

Originally posted for members on: January 6, 2011
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