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    <p>You could try enabling WCF tracing on the server. Insert this <strong>before</strong> the <code>&lt;/system.serviceModel&gt;</code> line:</p> <pre><code>&lt;diagnostics&gt; &lt;messageLogging logEntireMessage="true" logMalformedMessages="true" logMessagesAtServiceLevel="true" logMessagesAtTransportLevel="false" maxMessagesToLog ="3000" /&gt; &lt;/diagnostics&gt; </code></pre> <p>Insert this <strong>after</strong> the <code>&lt;/system.serviceModel&gt;</code> line:</p> <pre><code>&lt;system.diagnostics&gt; &lt;sharedListeners&gt; &lt;add name="sharedListener" type="System.Diagnostics.XmlWriterTraceListener" initializeData="c:\logs\tracelog.svclog" /&gt; &lt;/sharedListeners&gt; &lt;sources&gt; &lt;source name="System.ServiceModel" switchValue="Verbose, ActivityTracing" &gt; &lt;listeners&gt; &lt;add name="sharedListener" /&gt; &lt;/listeners&gt; &lt;/source&gt; &lt;source name="System.ServiceModel.MessageLogging" switchValue="Verbose"&gt; &lt;listeners&gt; &lt;add name="sharedListener" /&gt; &lt;/listeners&gt; &lt;/source&gt; &lt;source name="ApplicationLogging" switchValue="Information" &gt; &lt;listeners&gt; &lt;add name="sharedListener" /&gt; &lt;/listeners&gt; &lt;/source&gt; &lt;/sources&gt; &lt;/system.diagnostics&gt; </code></pre> <p>After you duplicate the error, start the <a href="http://msdn.microsoft.com/en-us/library/ms732023.aspx" rel="nofollow noreferrer">WCF tracing tool</a> and open the log file. There is probably some exception occurring.</p> <p>-- EDIT --</p> <p>Well, that's an interesting error message. It leads to more Google results:</p> <ol> <li><a href="https://stackoverflow.com/questions/323551/http-bad-request-error-when-requesting-a-wcf-service-contract">Another stackoverflow question</a></li> <li><a href="http://social.msdn.microsoft.com/Forums/en-US/wcf/thread/123f0d20-a018-48b0-ab92-4aae749f2d5e/" rel="nofollow noreferrer">Could be fixed in next release of Windows 7</a></li> <li><a href="https://stackoverflow.com/questions/1326816/bad-response-400-with-a-wcf-streaming-service-configured-programmatically">TransferMode.StreamedResponse</a></li> </ol>
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