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Commented Issue: AsyncFileUpload - Unknown Server Error when accessed via secure RAS SSL link. [26845]

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Server 2008 Standard,
.Net Framework 3.5
Visual Studio 2008

All service packs, etc.

I have an Ajax site, with master page, and on one page, I have a ModalPopupExtender that contains the UserControl ascx that has the actual AsyncFileUpload control from the toolkit.
Locally, the whole thing works.
I publish the web site to a server that is accessible by a RAS link like:

https://www.applicationdomain.ca/wacky4ef1223d2af908d38aaaed43e804799f881831f22ed9/wacky0/MyWebSite/Default.aspx?StartParam=Parameter Value
On the page, the user hits a button that says "Add File" : in the Popup, the user can click the 'Select File Button'; open the dialog box to select a file. This should start the asynchronous load of the file.

When accessed by this external link, the AsyncFileUpload control just reports "Unknown Server Error"
The server firewall (SSL Appliance) get no hits to say a file was being posted.
The Server has no file, nor any log of any activity at all.

The file selection box turns red, and displays the wonderful "Unknown Server Error" message. There is no exception to be caught. There is no timeout, as the error happens immediately when selecting the file.

Any ideas?


Comments: I find that using the previous AjaxControlToolkit.dll version 3.0.30930.0 works with the AsyncFileUpload but the later version 3.5.40412.2 does not work and throws this error.

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