HT203421: Troubleshooting the Mac App Store

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scboy
Level 1 (0 points)

Q: App Store Error Under Yosemite

First showed up a week ago while trying to update Xcode, and since prevents all and any purchases or downloads form App Store:

 

Complete error message reads:

 

App Store Error: Failed to verify the preflight file. It is not signed by Apple

 

I have not found any but work arounds for Mavericks that require lowering your security standards, any ideas?

MacBook Pro with Retina display, OS X Yosemite (10.10.3), iPhone 6, iPad Air 128

Posted on Jun 18, 2015 5:32 PM

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scboy

Q: App Store Error Under Yosemite

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  • by Carolyn Samit,

    Carolyn Samit Carolyn Samit Jun 18, 2015 5:47 PM in response to scboy
    Level 10 (122,048 points)
    Apple Music
    Jun 18, 2015 5:47 PM in response to scboy

    Hi,

     

    Try the suggestion by Michael A. N. here >  Failed to verify the preflight file. It is not signed by Apple.

  • by scboy,

    scboy scboy Jun 18, 2015 5:54 PM in response to scboy
    Level 1 (0 points)
    Jun 18, 2015 5:54 PM in response to scboy

    An update, out of frustration at the absence of any real answers to this issue I tried reducing the strictness of KeyChain requirements for signed certificates as advised elsewhere.

     

    The posts I have read all recommend you set your preference in KeyChain Access for Certificates to Best Attempt for both OCSP and CRL. But at least for downloading a new item that is free only changing the CRL preference to Best Attempt, from Require if Cert..., worked.

     

    But it would be nice to not have to weaken security, particularly on the App Store given the recent research showing Apps can be used to steal information held by other apps via sandbox vulnerabilities. See Ars Technica article here:
    security/2015/06/serious-os-x-and-ios-flaws-let-hackers-steal-keychain-1password -contents/