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Asked: 2026-05-27T18:01:40+00:00

I have a .NET 4.0 WCF service. If I send a soap message larger

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I have a .NET 4.0 WCF service. If I send a soap message larger than 64K, then I get “The remote server returned an unexpected response: (400) Bad Request” Error. It works fine all the way until I go over the 64K message size. I have read the many posts out there regarding what to do for this error, and as far as I can tell, I have the correct web.config values, but I still get the error. Below are the settings in my web.config. Anything I am missing? This occurs when communicating both to my local ASP.NET VS server and a remote Windows 2008 R2 IIS server. Is there a way to verify or log the maxReceivedMessageSize settings, etc. that are in the service binding in real-time or in the debugger? The service is hosted in MVC if that makes any difference.

<httpRuntime  maxRequestLength="50000000" />

...

…

<bindings>
  <basicHttpBinding>

    <binding name="IpsApiBinding" receiveTimeout="00:15:00" sendTimeout="00:05:00" maxReceivedMessageSize="40000000">
      <readerQuotas maxDepth="5000000" maxStringContentLength="50000000"
        maxArrayLength="50000000" maxBytesPerRead="50000000" />
    </binding>

  </basicHttpBinding>
</bindings>


<services>

  <service behaviorConfiguration="ApiBehavior" name="IPSApi.IpsApi">
    <endpoint behaviorConfiguration="endpointBehavior" binding="basicHttpBinding"
      bindingConfiguration="IpsApiBinding" name="IPSApi.IpsApi"
      contract="IPSApi.IIPSApi" />
  </service>

</services>

<behaviors>

  <endpointBehaviors>
    <behavior name="endpointBehavior">
      <dataContractSerializer maxItemsInObjectGraph="6553600" />
      <callbackDebug includeExceptionDetailInFaults="true" />
    </behavior>
  </endpointBehaviors>

  <serviceBehaviors>
    <behavior name="ApiBehavior">
      <serviceMetadata httpGetEnabled="true" />
      <serviceDebug includeExceptionDetailInFaults="true" />
    </behavior>
  </serviceBehaviors>

</behaviors>

<serviceHostingEnvironment multipleSiteBindingsEnabled="true" aspNetCompatibilityEnabled="true"  />

On the client side, the stack track is showing…

Server stack trace: at
System.ServiceModel.Channels.HttpChannelUtilities.ValidateRequestReplyResponse(HttpWebRequest
request, HttpWebResponse response, HttpChannelFactory factory,
WebException responseException, ChannelBinding channelBinding) at
System.ServiceModel.Channels.HttpChannelFactory.HttpRequestChannel.HttpChannelRequest.WaitForReply(TimeSpan
timeout) at
System.ServiceModel.Channels.RequestChannel.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) …

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1 Answer

  1. Editorial Team

    I figured out my problem. Here are the details. I am hosting my WCF service in a MVC app. The WCF service is in a separate DLL. I had the configuration settings in the web.config thinking that it would read its config from there. Come to find out, if in a separate DLL, then it will not use the web.config settings. It was just using the default bindings, etc.

    To get it to read the configuration in web.config, I used the method that was suggested in http://blogs.msdn.com/b/dotnetinterop/archive/2008/09/22/custom-service-config-file-for-a-wcf-service-hosted-in-iis.aspx . I created my own custom ServiceHostFactory and ServiceHost. In the ServiceHostFactory.CreateServiceHost I create an instance of my ServiceHost (derived class). In my ServiceHost derived class, I take over the ApplyConfiguration and load the config from the web.config.

    It works!

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