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POChange in User-Agent header triggering forms authentication
 

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    <p>I've got an app built using ASP.NET MVC 3.0. It uses asp.net's built in forms authentication, without session state, and cookies on the browser to identify the user making requests.</p> <p>Now, when I'm testing the app using IE9, the typical HTML request sends this user-agent in the header, and everything works fine.</p> <p>User-Agent: Mozilla/5.0 (compatible; MSIE 9.0; Windows NT 6.1; WOW64; Trident/5.0)</p> <p>However, we have one page in the app that has an ActiveX container that hosts Microsoft Word in the browser. The purpose of this ActiveX container is to allow you to make modifications to the word document, click on a button to POST that word document with your changes to our server so it can be saved.</p> <p>There is a method in the ActiveX control--Office Viewer Component from www.ocxt.com--called HttpPost() that POSTs the contents of the viewed document to the server.</p> <p>When you call HttpPost(), it sends all the same cookies properly, but uses a different User-Agent string.</p> <p>User-Agent: Mozilla/4.0 (compatible; MSIE 5.5; Windows NT 4.0)</p> <p>The UserAgent using MSIE 5.5 string appears to cause ASP.NET or MVC to not send the request to the appropriate controller, but instead sends a redirect response to the Login page even though the cookie is correct for the session. I did a test with Fiddler, and tried using MSIE 6.0, 7.0, 8.0 and those seem to work fine, so specifically, 5.5 causes part of the server stack to redirect to login page.</p> <p>This page used to work fine, so I'm not sure if something has changed in recent versions of ASP.NET/MVC, or is it because I've moved up to IE9.0, but basically, I'd like to know if it is possible to tell ASP.NET to not take the User-Agent into account when determining if a session has been authenticated already or not.</p> <p>Thanks.</p>
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