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    copied!<p>You might be able to achieve this in Silverlight by <strong>allowing cross-domain communication</strong> between the web server the hosts the Silverlight application and the remote WCF service.</p> <p>In that case you need to place a <a href="http://www.adobe.com/devnet/articles/crossdomain_policy_file_spec.html" rel="noreferrer"><strong>clientaccesspolicy.xml</strong></a> file at the root of the domain where the WCF service is hosted:</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="SOAPAction"&gt; &lt;domain uri="http://*"/&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> <p>Here's what <a href="http://msdn.microsoft.com/en-us/library/cc197955(v=vs.95).aspxhttp://msdn.microsoft.com/en-us/library/cc197955(v=vs.95).aspx" rel="noreferrer">MSDN states about this approach</a>:</p> <blockquote> <p>To allow access to an HTTPS service from any Silverlight control hosted over HTTP application, you need to put the <em>&lt;domain uri=”http://</em>” /&gt;* element inside your <em>&lt;allow-from&gt;</em> element.</p> </blockquote> <p>I haven't tried this myself but it could be worth a shot. Also be sure to check out the following resources for more details:</p> <ul> <li><a href="http://msdn.microsoft.com/en-us/library/cc197955(v=vs.95).aspxhttp://msdn.microsoft.com/en-us/library/cc197955(v=vs.95).aspx" rel="noreferrer">Making a Service Available Across Domain Boundaries</a></li> <li><a href="http://msdn.microsoft.com/en-us/library/cc197941(v=vs.95).aspx" rel="noreferrer">Configuring Web Service Usage in Silverlight Clients</a></li> </ul> <hr> <h2>Disabling X.509 certificate validation in .NET</h2> <p>For .NET applications this sample WCF configuration will disable validation of both whether the certificate is trusted and whether it is still valid on the client:</p> <pre><code>&lt;system.serviceModel&gt; &lt;behaviors&gt; &lt;endpointBehaviors&gt; &lt;behavior name="DisableServiceCertificateValidation"&gt; &lt;clientCredentials&gt; &lt;serviceCertificate&gt; &lt;authentication certificateValidationMode="None" revocationMode="NoCheck" /&gt; &lt;/serviceCertificate&gt; &lt;/clientCredentials&gt; &lt;/behavior&gt; &lt;/endpointBehaviors&gt; &lt;/behaviors&gt; &lt;client&gt; &lt;endpoint address="http://localhost/MyService" behaviorConfiguration="DisableServiceCertificateValidation" binding="wsHttpBinding" contract="MyNamespace.IMyService" name="MyServiceWsHttp" /&gt; &lt;/client&gt; &lt;/system.serviceModel&gt; </code></pre> <p><strong>An alternative solution</strong> is to provide custom logic to validate the X.509 certificate provided by the service. In that case you will have to modifiy the configuration file according to the following:</p> <pre><code>&lt;system.serviceModel&gt; &lt;behaviors&gt; &lt;endpointBehaviors&gt; &lt;behavior name="DisableServiceCertificateValidation"&gt; &lt;clientCredentials&gt; &lt;serviceCertificate&gt; &lt;authentication certificateValidationMode="Custom" customCertificateValidatorType="MyCertificateValidator, Client" revocationMode="NoCheck" /&gt; &lt;/serviceCertificate&gt; &lt;/clientCredentials&gt; &lt;/behavior&gt; &lt;/endpointBehaviors&gt; &lt;/behaviors&gt; &lt;client&gt; &lt;endpoint address="http://localhost/MyService" behaviorConfiguration="DisableServiceCertificateValidation" binding="wsHttpBinding" contract="MyNamespace.IMyService" name="MyServiceWsHttp" /&gt; &lt;/client&gt; &lt;/system.serviceModel&gt; </code></pre> <p>Then create a class that derives from <a href="http://msdn.microsoft.com/en-us/library/system.identitymodel.selectors.x509certificatevalidator.aspx" rel="noreferrer">X509CertificateValidator</a> to implement your custom validation logic.</p> <pre><code>public class MyCertificateValidator : X509CertificateValidator { public override void Validate(X509Certificate2 certificate) { // Add custom validation logic // Throw an exception to fail validation } } </code></pre> <p>As always, you can find <a href="http://msdn.microsoft.com/en-us/library/aa354512.aspx" rel="noreferrer">a more detailed example</a> up on MSDN.</p>
 

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