The underlying connection was closed: The connection was closed unexpectedly

Question

This exception is consistently thrown on a SOAP Request which takes almost three minutes to receive and is 2.25 megs in size.

When scouring the web I find all sorts

Answer 1

This is a generic error raised if there is an internal error.

Try adding tracing here: http://msdn.microsoft.com/en-us/library/ms732023(v=vs.110).aspx

You will see the full log then.

Answer 2

If you are using dbml instead of edmx you will get this( The underlying connection was closed: The connection was closed unexpectedly.) as dbml will not return serialisable data it needs datacontract so go to properties of dbml file and change the Serialization mode to unidirectional.

Answer 3

Have you tried the sugestion of this Blog Post? The problem will most probably lie in the TCP/HTTP stack implementation of .NET .

Answer 4

Tried several ways to get rid of this error message until I found this solution: http://kiranpatils.wordpress.com/2008/09/22/the-underlying-connection-was-closed-the-connection-was-closed-unexpectedly-while-returning-data-table-from-wcf-service/

You may change your List<> to DataSet. I suspect DataSet can handle much amount of data than the List<>.

Hope it helps.

Answer 5

You tagged the post as .NET35, so are you using WCF?

If so, here is an example of the App.config we use for large data sets:

<system.serviceModel>
    <bindings>
      <basicHttpBinding>
        <binding name="BasicHttpBinding" maxBufferSize="2147483647" maxReceivedMessageSize="2147483647">
          <readerQuotas maxDepth="32" maxStringContentLength="8388608" maxArrayLength="16384" maxBytesPerRead="4096" maxNameTableCharCount="16384" />
        </binding>
      </basicHttpBinding>
    </bindings>
    <client>
      <endpoint address="http://localhost:1602/EndPoint.svc" binding="basicHttpBinding" bindingConfiguration="BasicHttpBinding" contract="IEndPointContract" name="EndPoint" behaviorConfiguration="EndpointBehaviour" />     
    </client>
    <behaviors>
      <endpointBehaviors>
        <behavior name="EndpointBehaviour">
          <dataContractSerializer maxItemsInObjectGraph="2147483647" />
        </behavior>
      </endpointBehaviors>
    </behaviors>
  </system.serviceModel>

Answer 6

I have added another field, but didn't have a set on the property. That was my solution for the same error.

[DataMember]
public bool HasValue
{
    get { return true; }
    set { }//adding this line made the solution.
}