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POSilverlight WCF services: WCF is accessed through Client?
 

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    <p>Does a WCF service get called from the IIS server hosting the silverlight XAP or directly from the client's browser? If you were to put your WCF services on a server closer to your database (and not the same server as your Silverlight / ASP.NET page), would the WCF server's ports need to be opened to the world?</p> <p>It may be sound like a simple answer, but really it's not as obvious as it sounds for example:</p> <blockquote> <ol> <li>ClientAccessPolicy.xml</li> </ol> <p>This file helps you control which domains have access to call your WCF service. Here is a very basic example of how you can restrict access to only those applications running under your desired domain. This permits someone running your Silverlight application from both a secure and a non-secure url.</p> <pre><code>&lt;?xml version="1.0" encoding="utf-8"?&gt; &lt;access-policy&gt; &lt;cross-domain-access&gt; &lt;policy&gt; &lt;allow-from http-request-headers="*"&gt; &lt;domain uri="https://www.yourwebsite.com"/&gt; &lt;domain uri="http://www.yourwebsite.com"/&gt; &lt;/allow-from&gt; &lt;grant-to&gt; &lt;resource path="/" include-subpaths="true"/&gt; &lt;/grant-to&gt; &lt;/policy&gt; &lt;/cross-domain-access&gt; &lt;/access-policy&gt; </code></pre> </blockquote> <p>Sounds as if the call goes back to the web server which hosts the Silverlight application and then to the WCF service. </p> <p><strong>Additional:</strong> I understand that I may not have communicated my question well.</p> <p>If you have a server that you use for your WCF server (<strong>Server A</strong>) and a server hosting your Silverlight application (<strong>Server B</strong>)</p> <p>Does your client directly call <strong>Server A</strong> or does it make a request to <strong>Server B</strong> which is used as a proxy to communicate with <strong>Server A</strong>?</p> <p><strong>Server A</strong> is on one domain, <strong>Server B</strong> is on another domain, and <strong>Client</strong> is through the internet.</p>
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    1. COThe XAP accesses the WFC service directly. You can host a Silverlight application on Server A and have the WCF services on Server B. A client can get the XAP from Server A and communicate with the WCF services on Server B. You can shut down IIS on Server A and as long as the client keeps the XAP file open locally, will be unaware of the Sever A's status.
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