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Asked: 2026-05-11T13:57:23+00:00

I have a simple web service to allow applications to query my CMDB. The

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I have a simple web service to allow applications to query my CMDB. The function I am having trouble with works with a small resultset but fails with a larger one, indicating that it is something in the WCF service config that is preventing it succeeding.

I have a simple WinForms test app with a Service Reference to the web service and a single function that calls the function in question.

The smaller result set returns ~120KB of xml, the failing larger resultset is ~2MB. I have tried increasing the size of the maxReceivedMessageSize and maxStringContentLength without success.

Is there some config I have missed? I would be expecting a more detailed error message if that was the problem.

Thanks in advance,

Nick

The error the is returned is:

System.ServiceModel.CommunicationException: The underlying connection was closed: The connection was closed unexpectedly. ---> System.Net.WebException: The underlying connection was closed: The connection was closed unexpectedly.    at System.Net.HttpWebRequest.GetResponse()    at System.ServiceModel.Channels.HttpChannelFactory.HttpRequestChannel.HttpChannelRequest.WaitForReply(TimeSpan timeout)    --- End of inner exception stack trace ---  Server stack trace:     at System.ServiceModel.Channels.HttpChannelUtilities.ProcessGetResponseWebException(WebException webException, HttpWebRequest request, HttpAbortReason abortReason)    at System.ServiceModel.Channels.HttpChannelFactory.HttpRequestChannel.HttpChannelRequest.WaitForReply(TimeSpan timeout)    at System.ServiceModel.Channels.RequestChannel.Request(Message message, TimeSpan timeout)    at System.ServiceModel.Channels.ClientReliableChannelBinder`1.RequestClientReliableChannelBinder`1.OnRequest(TRequestChannel channel, Message message, TimeSpan timeout, MaskingMode maskingMode)    at System.ServiceModel.Channels.ClientReliableChannelBinder`1.Request(Message message, TimeSpan timeout, MaskingMode maskingMode)    at System.ServiceModel.Channels.ClientReliableChannelBinder`1.Request(Message message, TimeSpan timeout)    at System.ServiceModel.Security.SecuritySessionClientSettings`1.SecurityRequestSessionChannel.Request(Message message, TimeSpan timeout)    at System.ServiceModel.Dispatcher.RequestChannelBinder.Request(Message message, TimeSpan timeout)    at System.ServiceModel.Channels.ServiceChannel.Call(String action, Boolean oneway, ProxyOperationRuntime operation, Object[] ins, Object[] outs, TimeSpan timeout)    at System.ServiceModel.Channels.ServiceChannel.Call(String action, Boolean oneway, ProxyOperationRuntime operation, Object[] ins, Object[] outs)    at System.ServiceModel.Channels.ServiceChannelProxy.InvokeService(IMethodCallMessage methodCall, ProxyOperationRuntime operation)    at System.ServiceModel.Channels.ServiceChannelProxy.Invoke(IMessage message)  Exception rethrown at [0]:     at System.Runtime.Remoting.Proxies.RealProxy.HandleReturnMessage(IMessage reqMsg, IMessage retMsg)    at System.Runtime.Remoting.Proxies.RealProxy.PrivateInvoke(MessageData& msgData, Int32 type)    at TestRig.CmdbDataService.ICmdbDataService.GetMonitors(String client)    at TestRig.CmdbDataService.CmdbDataServiceClient.GetMonitors(String client) in C:\Documents and Settings\nfoster\My Documents\Visual Studio Projects\Virtual Operations Manuals\Trunk\src\TestRig\Service References\CmdbDataService\Reference.vb:line 1480    at TestRig.Form1.btnGetServers_Click(Object sender, EventArgs e) in C:\Apps\Virtual Operations Manuals\Trunk\src\TestRig\Form1.vb:line 8

The calling function in the application is:

Private Sub btnGetMonitors_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnGetMonitors.Click   txtResults.Text = String.Empty   Dim proxy As CmdbDataService.CmdbDataServiceClient = Nothing   Try     proxy = New CmdbDataService.CmdbDataServiceClient('WSHttpBinding_ICmdbDataService')     Dim monitors As TestRig.CmdbDataService.ConfigurationItems = proxy.GetMonitors(txtClientName.Text)     proxy.Close()     For Each monitor In monitors       txtResults.Text &= monitor.Name & ' (' & monitor.TypeName & ')' & vbCrLf     Next     txtResults.Text &= monitors.Count & ' monitors returned'   Catch ex As Exception     If Not IsNothing(proxy) AndAlso proxy.State <> ServiceModel.CommunicationState.Closed Then proxy.Abort()     txtResults.Text = ex.ToString   Finally     proxy = Nothing   End Try End Sub

On the test rig side the app.config contains the following serviceModel:

  <system.serviceModel>     <diagnostics>       <messageLogging logMalformedMessages='true' logMessagesAtServiceLevel='true'         logMessagesAtTransportLevel='true' />     </diagnostics>     <behaviors />     <bindings>       <wsHttpBinding>         <binding name='WSHttpBinding_Default' closeTimeout='00:05:00'           openTimeout='00:05:00' receiveTimeout='00:10:00' sendTimeout='00:05:00'           maxBufferPoolSize='104857600' maxReceivedMessageSize='104857600'>           <readerQuotas maxDepth='104857600' maxStringContentLength='104857600'             maxArrayLength='104857600' maxBytesPerRead='104857600' maxNameTableCharCount='104857600' />         </binding>       </wsHttpBinding>     </bindings>     <client>       <endpoint address='http://localhost/CmdbServices/DataService.svc/soap12'         binding='wsHttpBinding' bindingConfiguration='WSHttpBinding_Default'         contract='CmdbDataService.ICmdbDataService' name='WSHttpBinding_ICmdbDataService'>         <identity>           <userPrincipalName value='MyMachine\ASPNET' />         </identity>       </endpoint>     </client>   </system.serviceModel>

and on the service side the web.config is:

  <system.serviceModel>     <diagnostics performanceCounters='Default'>       <messageLogging logMalformedMessages='true' logMessagesAtServiceLevel='true'        logMessagesAtTransportLevel='true' />     </diagnostics>     <services>       <service behaviorConfiguration='ServiceBehavior' name='MyCorp.Cmdb.Services.DataService.CmdbDataService'>         <endpoint address='soap12' binding='wsHttpBinding' contract='MyCorp.Cmdb.Services.DataService.ICmdbDataService' />         <endpoint address='soap11' binding='basicHttpBinding' contract='MyCorp.Cmdb.Services.DataService.ICmdbDataService' />         <endpoint address='mex' binding='mexHttpBinding' contract='IMetadataExchange' />       </service>     </services>     <behaviors>       <serviceBehaviors>         <behavior name='ServiceBehavior'>           <serviceMetadata httpGetEnabled='true'/>           <serviceDebug includeExceptionDetailInFaults='true'/>         </behavior>       </serviceBehaviors>     </behaviors>   </system.serviceModel>
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1 Answer

  1. A collegue of mine has just pointed me at this blog post where the actual culprit is the maxItemsInObjectGraph property in the endpoint behaviours.

    Bumping these up has solved the problem, I must have just passed over the default threshold of 65536 😀

    Nice to see the error messages point you in the right direction 🙁

    Cheers….

    Also: You might get this error because one of your web methods are using class that is not a [DataContract] class.

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