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On a https website, some operations like ajax posting to the server are performed. For example:

$(".output").load("/server/ajax/", {client: 1234});

The above jQuery operation will perform a POST.

On the latest browsers like Firefox, Chrome and IE9, the above operation works with no issues. I have even tried with IE8 without any problems. However, there is a user on IE8 who's seeing the attached popup:

enter image description here

The above is in German. Is the English text errorFORBIDDEN the same for Windows EN? If not what is the equivalent and why is that popup occurring on that's user's Win7, IE8 and not on mine?

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Is the user using some kind of rewriting proxy or other tool (GreaseMonkey or similar) that would insert something like this? Or some kind of flawed cross-site scripting detection? –  GalacticCowboy Mar 6 '13 at 21:18
    
I'm not sure, she's just a regular user using the default OS, browser at her office. –  Thierry Lam Mar 6 '13 at 21:23
    
Do you have any authentication happening on the server? –  Paul Mar 6 '13 at 21:46
    
Yes, the user should already be authenticated before getting to the page where she can perform the ajax post operation. –  Thierry Lam Mar 6 '13 at 21:50
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