File Upload and ISA Proxy failing

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2 posts, 0 answers
  1. Dave Mateer
    Dave Mateer avatar
    2 posts
    Member since:
    Apr 2010

    Posted 27 Sep 2010 Link to this post


    When using IE6 behind an ISA Proxy the file upload sometimes fails after multiple uploads.  This is a SiteFinity site using a FileUpload control.  Here is a screenshot:

    I've made the file upload simple.  ie it only does 1 at a time, then renders the page to show a thumbnail of the recently uploaded photo.

    Here is what I got back from the admin:

    "Looking at our Proxy Server, the monitor shows Windows Authentication being used to make the connection at the start, but then it changes to Anonymous and The ISA Server goes, denied (can't have unknowns accessing the Internet).

    By-Pass the Proxy Server (ie: make a direct connection to the Internet) and all works well. From my perspective, I can make a rule to allow this website direct access on our side, but it's not ideal and only resolves the problem for the CCC.. I'll be expecting this same issue with any other business working behind an ISA box."

    Does this ring any bells, and any advice on where to start debugging?


  2. Genady Sergeev
    Genady Sergeev avatar
    1600 posts

    Posted 30 Sep 2010 Link to this post

    Hi Dave Mateer,

    RadUpload in essence is the standard <input type='file' /> tag with skinning and added functionality. However, the very process of uploading files is handled by the browser and is quite standard and will produce the same results as the standard upload. And the standard requests are windows authenticated. This means that the request for uploading files is going to be windows authenticated as long as the standard ASP.NET FileUpload or RadUpload is used. However, the things might change if RadAsyncUpload is used. Is this the case?

    All the best,
    Genady Sergeev
    the Telerik team
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