Unknown error 400 when updating apps through iTunes.

Question

Unknown error 400 when updating apps through iTunes.

I have been getting an error message 400 when trying to update apps from the app store on my macbook. I can only update them from my iphone. I am able to purchase and download the original apps as well as music and movies. Are there any fixes for this issue? I do not have this problem on my imac.
Thanks

Macbook, Mac OS X (10.6.2), iTune 9.0.2

Posted on Jan 5, 2010 4:57 PM

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Answer 1

AD/JPG

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Jan 10, 2010 1:22 PM in response to scubadadseattle

I've been receiving the same error over and over again.

Is there a solution for that?

Is there a problem in filepermission issues, when you are using two different machines?
I first downloaded apps in my pc and then took them back to my macbook.

Message was edited by: AD/JPG

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Answer 2

AD/JPG

Level 1

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Jan 24, 2010 12:23 PM in response to AD/JPG

There aren't still any good solution to this annoying problem?

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Answer 3

Mar 24, 2010 10:03 PM in response to scubadadseattle

I had the same problem and after a full day on the phone with Apple, there was no solution. Then, I tripped over it! The issue was with a third party program that was supposed to be allowing all traffic, but wasn't. The program is NetBarrier and once it was removed and my MacBook Pro was rebooted, all was great. The iMac wasn't affected (in my case) because I never installed that program on the iMac.

I blogged it here: http://www.wickedblog.com/2010/03/23/itunes-wont-update-apps-itunes-error-400/. I hope this helps others avoid hours of searching. 🙂

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