The underlying connection was closed: The connection was closed unexpectedly wcf service - wcf

Question

The underlying connection was closed: The connection was closed unexpectedly
This is a generic error, and since I am very new to wcf I don't know where to start diagnosing the problem. I've been searching google for hours, and really need an advice from someone with more experience with wcf. So please bear with me, I will try to describe the problem the best I can.
My domain is made of a wcf project and a class library project where i have the data entities. I have 1 svc file. I call the service in my asp.net mvc 3 controller. doing something pretty simple. I will post the relevant code and stack trace.
I am trying to display a list of candidates in the list action of the candidates controller. I added a service reference to the mvc project, and pointed it to my localhost (the service it was discovered and it is running).
Stack Trace:
[WebException: The underlying connection was closed: The connection was closed unexpectedly.]
System.Net.HttpWebRequest.GetResponse() +6117395
System.ServiceModel.Channels.HttpChannelRequest.WaitForReply(TimeSpan timeout) +48
[CommunicationException: The underlying connection was closed: The connection was closed unexpectedly.]
System.Runtime.Remoting.Proxies.RealProxy.HandleReturnMessage(IMessage reqMsg, IMessage retMsg) +9440287
System.Runtime.Remoting.Proxies.RealProxy.PrivateInvoke(MessageData& msgData, Int32 type) +345
ADMWeb.UI.ADMServices.IADM.GetCandidateList() +0
ADMWeb.UI.ADMServices.ADMClient.GetCandidateList() in C:\Users\ori\Documents\Visual Studio 2010\Projects\ADMWeb\ADMWeb.UI\Service References\ADMServices\Reference.cs:1025
ADMWeb.UI.Controllers.CandidatesController.Index() in C:\Users\ori\Documents\Visual Studio 2010\Projects\ADMWeb\ADMWeb.UI\Controllers\CandidatesController.cs:22
lambda_method(Closure , ControllerBase , Object[] ) +62
System.Web.Mvc.ActionMethodDispatcher.Execute(ControllerBase controller, Object[] parameters) +17
System.Web.Mvc.ReflectedActionDescriptor.Execute(ControllerContext controllerContext, IDictionary`2 parameters) +208
System.Web.Mvc.ControllerActionInvoker.InvokeActionMethod(ControllerContext controllerContext, ActionDescriptor actionDescriptor, IDictionary`2 parameters) +27
System.Web.Mvc.<>c__DisplayClass15.<InvokeActionMethodWithFilters>b__12() +55
System.Web.Mvc.ControllerActionInvoker.InvokeActionMethodFilter(IActionFilter filter, ActionExecutingContext preContext, Func`1 continuation) +263
System.Web.Mvc.<>c__DisplayClass17.<InvokeActionMethodWithFilters>b__14() +19
System.Web.Mvc.ControllerActionInvoker.InvokeActionMethodWithFilters(ControllerContext controllerContext, IList`1 filters, ActionDescriptor actionDescriptor, IDictionary`2 parameters) +191
System.Web.Mvc.ControllerActionInvoker.InvokeAction(ControllerContext controllerContext, String actionName) +343
System.Web.Mvc.Controller.ExecuteCore() +116
System.Web.Mvc.ControllerBase.Execute(RequestContext requestContext) +97
System.Web.Mvc.ControllerBase.System.Web.Mvc.IController.Execute(RequestContext requestContext) +10
System.Web.Mvc.<>c__DisplayClassb.<BeginProcessRequest>b__5() +37
System.Web.Mvc.Async.<>c__DisplayClass1.<MakeVoidDelegate>b__0() +21
System.Web.Mvc.Async.<>c__DisplayClass8`1.<BeginSynchronous>b__7(IAsyncResult _) +12
System.Web.Mvc.Async.WrappedAsyncResult`1.End() +62
System.Web.Mvc.<>c__DisplayClasse.<EndProcessRequest>b__d() +50
System.Web.Mvc.SecurityUtil.<GetCallInAppTrustThunk>b__0(Action f) +7
System.Web.Mvc.SecurityUtil.ProcessInApplicationTrust(Action action) +22
System.Web.Mvc.MvcHandler.EndProcessRequest(IAsyncResult asyncResult) +60
System.Web.Mvc.MvcHandler.System.Web.IHttpAsyncHandler.EndProcessRequest(IAsyncResult result) +9
System.Web.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() +9030045
System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously) +184
The Error:
Line 1024: public ADMWeb.UI.ADMServices.Candidate[] GetCandidateList() {
Line 1025: return base.Channel.GetCandidateList(); Line 1026: }
ADM.svc:
namespace ADMServices
{
public class ADM : IADM
{
public List<Candidate> GetCandidateList()
{
List<Candidate> candidateList = new List<Candidate>();
candidateList = CandidateManager.GetCandidateList();
return candidateList;
}
}
}
Candidates Controller (List Action):
ADMClient client = new ADMClient();
List<Candidate> candidates = client.GetCandidateList().ToList();
return View(candidates);
WCF Project web.config:
<?xml version="1.0"?>
<configuration>
<system.web>
<compilation debug="true" targetFramework="4.0" />
</system.web>
<connectionStrings>
<add name="ADMConnectionString" connectionString="Data Source=;Initial Catalog=ADM_ATID;Persist Security Info=True;User ID;Password"
providerName="System.Data.SqlClient" />
</connectionStrings>
<system.serviceModel>
<behaviors>
<serviceBehaviors>
<behavior>
<!-- To avoid disclosing metadata information, set the value below to false and remove the metadata endpoint above before deployment -->
<serviceMetadata httpGetEnabled="true"/>
<!-- To receive exception details in faults for debugging purposes, set the value below to true. Set to false before deployment to avoid disclosing exception information -->
<serviceDebug includeExceptionDetailInFaults="false"/>
</behavior>
</serviceBehaviors>
</behaviors>
<serviceHostingEnvironment multipleSiteBindingsEnabled="true" />
</system.serviceModel>
<system.webServer>
<modules runAllManagedModulesForAllRequests="true"/>
</system.webServer>
<system.diagnostics>
<sources>
<source name="System.ServiceModel"
switchValue="Information, ActivityTracing"
propagateActivity="true" >
<listeners>
<add name="xml"/>
</listeners>
</source>
<source name="System.ServiceModel.MessageLogging">
<listeners>
<add name="xml"/>
</listeners>
</source>
<source name="myUserTraceSource"
switchValue="Information, ActivityTracing">
<listeners>
<add name="xml"/>
</listeners>
</source>
</sources>
<sharedListeners>
<add name="xml"
type="System.Diagnostics.XmlWriterTraceListener"
initializeData="Error.svclog" />
</sharedListeners>
</system.diagnostics>
</configuration>
MVC web.config:
<system.serviceModel>
<bindings>
<basicHttpBinding>
<binding name="BasicHttpBinding_IADM" closeTimeout="00:01:00"
openTimeout="00:01:00" receiveTimeout="00:10:00" sendTimeout="00:01:00"
allowCookies="false" bypassProxyOnLocal="false" hostNameComparisonMode="StrongWildcard"
maxBufferSize="65536" maxBufferPoolSize="524288" maxReceivedMessageSize="65536"
messageEncoding="Text" textEncoding="utf-8" transferMode="Buffered"
useDefaultWebProxy="true">
<readerQuotas maxDepth="32" maxStringContentLength="8192" maxArrayLength="16384"
maxBytesPerRead="4096" maxNameTableCharCount="16384" />
<security mode="None">
<transport clientCredentialType="None" proxyCredentialType="None"
realm="" />
<message clientCredentialType="UserName" algorithmSuite="Default" />
</security>
</binding>
</basicHttpBinding>
</bindings>
<client>
<endpoint address="http://localhost:49341/ADM.svc" binding="basicHttpBinding"
bindingConfiguration="BasicHttpBinding_IADM" contract="ADMServices.IADM"
name="BasicHttpBinding_IADM" />
</client>

Answer 1

The first thing i will do is, instead of returning the full list of candidates i will return an empty list. If that works fine, then it is very clear that the size of the data is a problem. To modify the size play with your binding parameters.