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POWin32Exception @ ServiceHost.Open() for WCF service
 

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    <p>I am working on writing BDD specifications for a broad set of WCF service infrastructure I am writing. I have noticed that each specification I write that involves a call to ServiceHost.Open(), that line takes a good 2 - 6 seconds to execute (the time keeps growing as I add more and more specs). I noticed that when this method is called, a Win32Exception is thrown:</p> <pre><code>Win32Exception occurred Message: The specified domain either does not exist or could not be contacted. Stack Trace: at System.ServiceModel.UpnEndpointIdentity.GetUpnFromDownlevelName(String downlevelName) NativeErrorCode: 1355 ErrorCode: -2147467259 </code></pre> <p>The ServiceModel configuration is as follows: </p> <pre><code>&lt;system.serviceModel&gt; &lt;services&gt; &lt;service name="TestServices.Calculator" behaviorConfiguration="default"&gt; &lt;endpoint name="calculator" address="" binding="wsHttpBinding" contract="TestServiceContracts.ICalculator" /&gt; &lt;endpoint address="mex" binding="mexHttpBinding" contract="IMetadataExchange" /&gt; &lt;host&gt; &lt;baseAddresses&gt; &lt;add baseAddress="http://localhost/calculator" /&gt; &lt;/baseAddresses&gt; &lt;/host&gt; &lt;/service&gt; &lt;/services&gt; &lt;behaviors&gt; &lt;serviceBehaviors&gt; &lt;behavior name="default" &gt; &lt;serviceMetadata httpGetEnabled="true" /&gt; &lt;/behavior&gt; &lt;/serviceBehaviors&gt; &lt;/behaviors&gt; &lt;/system.serviceModel&gt; </code></pre> <p>Note: I have configured Http.sys and added <a href="http://+:80/calculator/" rel="nofollow noreferrer">http://+:80/calculator/</a> as an http namespace exclusion, so that is not part of the problem. </p> <p>This error is most severe on a Windows 7 Ultimate system. On a Vista Ultimate system, it does not seem to cause as much of a performance hit, however ServiceHost.Open() is the vast bulk of the time spent in execution. I don't understand why it is an issue at all when the URL's are localhost...I would expect the loopback interface to be the fastest of all.</p>
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