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  • Luke Hook 45 posts 174 karma points c-trib
    Jul 17, 2019 @ 15:47
    Luke Hook

    Umbraco 8 backoffice media not showing thumbs in picker

    Hi guys,

    I've got an Umbraco 8.1 installation that due to various requirements needs to be hosted in a virtual directory of another project. (I'm aware this isn't recommended / suggested / clever)

    For the most part I've got everything to work, I'm using Azure blob storage for media and with some SQL scripts for existing images have everything uploading and working as required.

    The only thing outstanding is i'm missing thumbnail images in the media picker property editor. Thumbs work fine in the Media Library section and in the editor pane for a media item. But will not show the thumbs in the picker.

    The difference here is it seems to be calling the Umbraco API to GetBigThumbnail


    I know the originalImagePath is right as I can navigate to it directly. But in the console I'm seeing the following errors

    Failed to load resource: the server responded with a status of 401 (Unauthorized)

    Obviously I suspect this is something to do with the virtual directory set up but it seems odd that authorization would be the issue? Is there anything specific in terms of folder permissions for example that I need to adjust?

    Thanks, Luke

  • Hugo Becerra 12 posts 82 karma points
    Sep 02, 2019 @ 08:59
    Hugo Becerra

    Hi Luke,

    Did you find any solution to this? Because I'm having some issues working with a media virtual directory.


  • Luke Hook 45 posts 174 karma points c-trib
    Sep 02, 2019 @ 09:15
    Luke Hook

    Hi Hugo, Unfortunately not. Everything else seems to be ok but I never had a solution for this so the client is using the CMS without the thumbs at the moment.

    If you do find a solution please do let me know also :)

  • Hugo Becerra 12 posts 82 karma points
    Sep 02, 2019 @ 09:17
    Hugo Becerra

    Ok, I will let you know. Thanks! :)

  • Ivan Doroshenko 3 posts 23 karma points
    Oct 08, 2019 @ 09:11
    Ivan Doroshenko


    I have the same problem with the AWS provider. Waiting for a solution.


  • Richard Ockerby 14 posts 125 karma points MVP c-trib
    Jun 23, 2020 @ 16:54
    Richard Ockerby

    We've just had this issue in production but for all images - not just the thumbs but thought this might help.

    Turns out that we needed to give both IUSR and the app pool identity access to the folder.

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