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POsilverlight 3: long running wcf call triggers 401.1 (access denied)
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  1. POsilverlight 3: long running wcf call triggers 401.1 (access denied)
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    copied!<p>I have a wcf service consumed by a silverlight 3 control. The Silverlight client uses a basicHttpBindinging that is constructed at runtime from the control's initialization parameters like this: </p> <pre><code>public static T GetServiceClient&lt;T&gt;(string serviceURL) { BasicHttpBinding binding = new BasicHttpBinding(Application.Current.Host.Source.Scheme.Equals("https", StringComparison.InvariantCultureIgnoreCase) ? BasicHttpSecurityMode.Transport : BasicHttpSecurityMode.None); binding.MaxReceivedMessageSize = int.MaxValue; binding.MaxBufferSize = int.MaxValue; binding.Security.Mode = BasicHttpSecurityMode.TransportCredentialOnly; return (T)Activator.CreateInstance(typeof(T), new object[] { binding, new EndpointAddress(serviceURL)}); } </code></pre> <p>The Service implements windows security. Calls were returning as expected until the result set increased to several thousand rows at which time HTTP 401.1 errors were received.</p> <p>The Service's HttpBinding defines closeTime, openTimeout, receiveTimeout and sendTimeOut of 10 minutes.</p> <p>If I limit the size of the resultset the call suceeds.</p> <p>Additional Observations from Fiddler: When Method2 is modified to return a smaller resultset (and avoid the problem), control initialization consists of 4 calls:</p> <ol> <li>Service1/Method1 -- result:401</li> <li>Service1/Method1 -- result:401 (this time header includes element "Authorization: Negotiate TlRMTV..."</li> <li>Service1/Method1 -- result:200</li> <li>Service1/Method2 -- result:200 (1.25 seconds)</li> </ol> <p>When Method2 is configured to return the larger resultset we get:</p> <ol> <li>Service1/Method1 -- result:401 </li> <li>Service1/Method1 -- result:401 (this time header includes element "Authorization:Negotiate TlRMTV..."</li> <li>Service1/Method1 -- result:200</li> <li>Service1/Method2 -- result:401.1 (7.5 seconds)</li> <li>Service1/Method2 -- result:401.1 (15ms)</li> <li>Service1/Method2 -- result:401.1 (7.5 seconds)</li> </ol>
 

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