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    <p>I beat my head against the wall for weeks on this problem. Here's what I learned and how I finally worked around it.</p> <p>Prism's FileDownloader class uses System.Net.WebClient to load modules. In OOB mode, WebClient seems to use the same stack as IE, but it apparently either doesn't send the client certificate, or (more likely) doesn't correctly negotiate the SSL/client cert handshake with the server. I say this because:</p> <ul> <li>I was able to successfully request .xap files using Firefox and Chrome;</li> <li>I was <em>not</em> able to successfully request .xap files using IE;</li> <li>IIS would fail with a 500, not a 403.</li> </ul> <p>I couldn't get good visibility into what was actually happening over the wire; if I used Fiddler, it would work, because Fiddler intercepts communications with the server and handles the client certificate handshake itself. And trying to use a packet sniffer obviously wouldn't tell me anything because of SSL.</p> <p>So - I first spent a lot of time on the server side trying to eliminate things (unneeded handlers, modules, features, etc.) that might be causing the problem.</p> <p>When that didn't work, I tried modifying the Prism source code to use the browser's HTTP stack instead of WebClient. To do this, I created a new class similar in design to FileDownloader, implementing IFileDownloader, that used the browser stack. I then made some changes to XapModuleTypeLoader (which instantiates the downloader) to make it use the new class. This approach failed with the same error I was originally experiencing.</p> <p>Then I started researching whether a commercial third-party HTTP stack might be available. I found one that supported the features I needed and that supported the Silverlight 4 runtime. I created another implementation of IFileDownloader that used that stack, and BOOM - it worked.</p> <p>The good news with this approach is that not only can I use this to load modules, I can also use it to protect communications between the client and our REST API (a benefit we were going to give up, before).</p> <p>I plan to submit a patch to Prism to allow the downloader to be registered or bound externally, as it's currently hard-coded to use its own FileDownloader. If anyone is interested in that or in the commercial HTTP stack I'm using, contact me (msimpson -at- abelsolutions -dot- com) for links and code samples.</p> <p>And I must say this - I still don't know for sure whether the root problem is in the HTTP stack on the client side or the server side, but it's a FAIL on Microsoft's part nonetheless.</p>
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    1. POSilverlight 4 OOB + Browser HTTP Stack + Client Certificates = FAIL?
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    1. COTurns out the third-party stack is either buggy, or we can't figure out how to use it right, because we get various errors using it. So I'm back to the drawing board on this issue :-(
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