Refresh Error - AppContainer Loopback Exemption Utility

4 posts, 0 answers
  1. Matthew
    Matthew avatar
    16 posts
    Member since:
    Dec 2004

    Posted 30 Aug Link to this post

    This is regarding an error I get every time I try to Refresh the list in the "AppContainer Loopback Exemption Utility" originally written by Eric Lawrence.

    I have just installed Fiddler 4 (v4.6.20172.34691, built 2017-08-15) on Windows 10. Upon clicking the "WinConfig" button on the interface, it runs the utility asking for Elevated rights which I grant. The first time I ever ran it, it threw an "Orphaned Exemption Record Found” exception and continued to do so until I reset them by clicking "Except None" followed by "Save Changes."

    However, the attached error has persisted. Text below for search indexing. :)

    Warning: Unable to use NetIsoEnumAppContainers to get AppContainer list. Error Code: 0x3. Attempting manual registry crawl; some information will be unavailable.

  2. Simeon
    Admin
    Simeon avatar
    8 posts

    Posted 05 Sep Link to this post

    Hi,

    Sorry for the late reply. We were able to reproduce the problem regarding the "Orphaned Exemption Record Found" warning. We will make further investigation and will try to fix the problem for a future version of Fiddler. Please, update your version of Fiddler regularly.

    As a temporary, workaround you could click on the "No" button when the warning appears, in order to stop it from poping-up again, until the next time you start the tool again.

    Regards,

    Progress Telerik
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  3. Jimmy
    Jimmy avatar
    1 posts
    Member since:
    Oct 2017

    Posted 07 Oct Link to this post

    hi, i have a different problem , the winconfig button on the top left side of the fiddler i installed directly form your site is missing ive downloaded and install it twice , on my desktop and on my laptop both running on win7 32-bit. same problem. winconfig is not there its missing. can you help me on this one.
  4. Simeon
    Admin
    Simeon avatar
    8 posts

    Posted 12 Oct Link to this post

    Hello,

    The WinConfig button appears if you are running Fiddler on Windows versions greater or equal than 8. The button is used for launching the EnableLoopback utility tool of Fiddler. This tool is used for exempting AppContainers from loopback restrictions. The AppContainer is a technology which was introduced with the Windows 8 Metro Style apps, hence you don't need the WinConfig button and the EnableLoopback utility on Windows 7 and earlier versions.

    Regards,
    Simeon
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