Develop Reference

Error 415 while testing my wcf service

I have a Restful service that has this OperationContract
[OperationContract]
[WebInvoke(Method = "POST",
ResponseFormat = WebMessageFormat.Json,
BodyStyle = WebMessageBodyStyle.Wrapped,
UriTemplate = "json")]
Response JSONData(Request request);
and is configured in this way
<?xml version="1.0"?>
<configuration>
<system.web>
<compilation debug="true" targetFramework="4.0" />
</system.web>
<system.serviceModel>
<bindings>
<basicHttpBinding>
<binding name="BasicHttpBinding_IService" closeTimeout="01:01:00"
openTimeout="01:01:00" receiveTimeout="01:10:00" sendTimeout="01:01:00"
allowCookies="false" bypassProxyOnLocal="false" hostNameComparisonMode="StrongWildcard"
maxBufferSize="2147483647" maxBufferPoolSize="2147483647" maxReceivedMessageSize="2147483647"
messageEncoding="Text" textEncoding="utf-8" transferMode="Streamed"
useDefaultWebProxy="true">
<readerQuotas maxDepth="2147483647" maxStringContentLength="2147483647" maxArrayLength="2147483647"
maxBytesPerRead="2147483647" maxNameTableCharCount="2147483647" />
<security mode="None">
<transport clientCredentialType="None" proxyCredentialType="None"
realm="" />
<message clientCredentialType="UserName" algorithmSuite="Default"/>
</security>
</binding>
</basicHttpBinding>
<webHttpBinding>
<binding name="WebHttpBinding_IService" closeTimeout="01:01:00" openTimeout="01:01:00"
receiveTimeout="01:10:00" sendTimeout="01:01:00" allowCookies="false"
bypassProxyOnLocal="false" hostNameComparisonMode="StrongWildcard"
maxBufferSize="2147483647" maxBufferPoolSize="2147483647" maxReceivedMessageSize="2147483647"
transferMode="Streamed" useDefaultWebProxy="true">
<readerQuotas maxDepth="2147483647" maxStringContentLength="2147483647"
maxArrayLength="2147483647" maxBytesPerRead="2147483647" maxNameTableCharCount="2147483647" />
<security mode="None" />
</binding>
<binding name="webHttpBindingXML"/>
<binding name="webHttpBindingJSON"/>
</webHttpBinding>
</bindings>
<services>
<service name="SearchService.SearchService" behaviorConfiguration="ServiceBehaviour">
<!-- Service Endpoints -->
<!-- Unless fully qualified, address is relative to base address supplied above -->
<endpoint address ="" binding="webHttpBinding" bindingConfiguration="WebHttpBinding_IService" contract="SearchService.ISearchService" behaviorConfiguration="web">
<!--
Upon deployment, the following identity element should be removed or replaced to reflect the
identity under which the deployed service runs. If removed, WCF will infer an appropriate identity
automatically.
-->
</endpoint>
</service>
</services>
<behaviors>
<serviceBehaviors>
<behavior name="ServiceBehaviour">
<!-- 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="true"/>
</behavior>
</serviceBehaviors>
<endpointBehaviors>
<behavior name="web">
<webHttp/>
</behavior>
</endpointBehaviors>
</behaviors>
<serviceHostingEnvironment multipleSiteBindingsEnabled="true" />
<standardEndpoints>
<webHttpEndpoint>
<standardEndpoint
automaticFormatSelectionEnabled="true"
helpEnabled="true" />
</webHttpEndpoint>
</standardEndpoints>
</system.serviceModel>
<system.webServer>
<modules runAllManagedModulesForAllRequests="true"/>
</system.webServer>
</configuration>
The request object is formed in this way
[DataContract]
public class Query
{
[DataMember]
public string name { get; set; }
[DataMember]
public string birthDate { get; set; }
}
[DataContract]
public class Input
{
[DataMember]
public Query query { get; set; }
[DataMember]
public string login_username { get; set; }
[DataMember]
public string login_password { get; set; }
}
[DataContract]
public class Request
{
[DataMember]
public Input input { get; set; }
}
I created a small client to test this query and I've also tested it using WCFTestClient and works fine. If I try to access this through fiddler though I get a 415 Unsupported Media Type error.
I tried this in the following manner
POST, http://localhost:8080/HostDevServer/SearchService.svc/json, HTTP/1.1
User-Agent: Fiddler
Content-Type: application/json;charset=UTF-8
Host: localhost:8080
Content-Length: 368
{ "input": { "login_password": "pass", "login_username": "login name", "query": { "birthDate": "", "name": "robert" } } }
I also tried deploying this service and see if fiddler would be able to access it then, but things got even more confusing because now instead of getting a 415 I was getting a 400 complaining about 'Reference to an object not set to an instance of the object.' and the small command line client I created would complain about There was no endpoint listening at the location of my service.
My question is, is there something wrong with my configuration file, or did I compose the fiddler request in the wrong way? If yes how can I fix this so I can access my service normally?

I can see that you are using BodyStyle = WebMessageBodyStyle.Wrapped
This means that you need to wrap the actual data with the name of the variable expected by your OperationContract. In short this should work
{ "response": { "input": { "login_password": "pass", "login_username": "login name", "query": { "birthDate": "", "name": "robert" } } } }
If you want to keep the body content as is then I suggest you use Bare instead of Wrapped for the body style.

No endpoint listening at local "..."

I have been given a wcf service, and i built a local console applicattion to test it, but i keep getting this error shown in the title. My service runs in the browser as it should, showing the screen where it shows the example and the url where you can test it. Probably the error is in the Web.config or in the App.config. I have this two files:
Web.condig
<?xml version="1.0"?>
<configuration>
<appSettings>
...
</appSettings>
<system.web>
<compilation debug="false" targetFramework="4.0"/>
</system.web>
<system.webServer>
<modules runAllManagedModulesForAllRequests="true"/>
</system.webServer>
<system.serviceModel>
<bindings>
<webHttpBinding>
<binding name="webHttpBindingWithJsonP" crossDomainScriptAccessEnabled="true"/>
</webHttpBinding>
</bindings>
<behaviors>
<endpointBehaviors>
<behavior name="webHttpBehavior">
<webHttp helpEnabled="true"/>
</behavior>
</endpointBehaviors>
<serviceBehaviors>
<behavior>
<serviceMetadata httpGetEnabled="true"/>
</behavior>
</serviceBehaviors>
</behaviors>
<serviceHostingEnvironment aspNetCompatibilityEnabled="true"/>
<services>
<service name="RAHPEDWCFService.RAHPEDService">
<endpoint address="http://localhost:44184/RAHPEDService.svc" behaviorConfiguration="webHttpBehavior" binding="webHttpBinding" bindingConfiguration="webHttpBindingWithJsonP" contract="RAHPEDWCFService.IRAHPEDService"/>
</service>
</services>
</system.serviceModel>
</configuration>
App.config
<?xml version="1.0" encoding="utf-8" ?>
<configuration>
<system.serviceModel>
<bindings>
<basicHttpBinding>
<binding name="BasicHttpBinding_IRAHPEDService" 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:44184/RAHPEDService.svc"
binding="basicHttpBinding"
bindingConfiguration="BasicHttpBinding_IRAHPEDService"
contract="ServiceReference.IRAHPEDService"
name="BasicHttpBinding_IRAHPEDService" />
</client>
</system.serviceModel>
</configuration>
I hope someone could give me a hint.

Please follow the below steps to resolve it
Please browse your service and click on the Url whether it is showing the metadata or not.
ex:http: //oj:23/Myservice?wsdl
If metadata is not enabled then do the below changes to your service config file.
i. create a mex endpoint
ii. Name the service behavior
Ex:
< serviceBehaviors>
< behavior name="SerBehavior">
< serviceMetadata httpGetEnabled="true"/>
< /behavior>
< /serviceBehaviors>
iii. Add this behavior to your service
Ex:
< service name="RAHPEDWCFService.RAHPEDService" behaviorConfiguration="SerBehavior"> < /service>
iv. Build the service and browse click on url to check the metaData
In your console application right click on the project and click on Add Service Reference
Place the Url in the Address box, click on Go check whether you are able to see the service, select your service and give namespace and click OK
create the object of your ServiceClient
Call your method
able to see the wsdl metadata in the browser.
If you have multiple endpoints in your client configuration file then you have pass the name of the endpoint to the constructor of ServiceCleint Class
Open Visual studio CommandPrompt and type WcfTestClient, right click on MyServiceProjects, add the service and check whether you are able to add or not and once added call your method under the endpoint appears

You should check that you are accessing the correct address. Rather than specify the entire address in the Web.config, more common practice is to provide just a relative address (even
an empty "" is fine), and then you access the service with:
http://servername:[port]/[virtual directory]/RAHPEDWCF.svc/[relative address in Web.config]
E.g. if address in Web.config showed
endpoint address="MySVC"
the full URL for clients (assuming default port 80 and in root of virtual server) might be
http://servername/RAHPEDWCF.svc/MySVC
If you are able to modify Web.config, this is what I would advise.

WCF in Mono 2.10.9 performance issues

I have a simple WCF host and client which run fine in Windows but suffer extremely bad performance on Mono 2.10.8/9.
The WCF host is running in a self-hosted console app.
WCF client is also a simple console app.
They're using netTcpBinding without any security.
Here's the host app.config:
<?xml version="1.0" encoding="utf-8"?>
<configuration>
<system.serviceModel>
<behaviors>
<serviceBehaviors>
<behavior name="MetadataBehavior">
<serviceMetadata />
</behavior>
</serviceBehaviors>
</behaviors>
<services>
<service behaviorConfiguration="MetadataBehavior" name="EmployeeServiceLib.EmployeeService">
<clear />
<endpoint address="net.tcp://localhost:8888/EmployeeService/tcp"
binding="netTcpBinding" bindingConfiguration="ultra" name="EmployeeService"
contract="EmployeeServiceLib.IEmployeeService" listenUriMode="Explicit" />
</service>
</services>
<bindings>
<netTcpBinding>
<binding name="ultra" transactionFlow="false" transferMode="Streamed">
<reliableSession enabled="false" />
<security mode="None" />
</binding>
</netTcpBinding>
</bindings>
</system.serviceModel>
</configuration>
client app.config:
<?xml version="1.0" encoding="utf-8" ?>
<configuration>
<system.serviceModel>
<bindings>
<netTcpBinding>
<binding name="EmployeeService" closeTimeout="00:01:00" openTimeout="00:01:00"
receiveTimeout="00:10:00" sendTimeout="00:01:00" transactionFlow="false"
transferMode="Streamed" transactionProtocol="OleTransactions"
hostNameComparisonMode="StrongWildcard" listenBacklog="10"
maxBufferPoolSize="65536" maxBufferSize="65536" maxConnections="10"
maxReceivedMessageSize="1048576">
<readerQuotas maxDepth="32" maxStringContentLength="8192" maxArrayLength="16384"
maxBytesPerRead="4096" maxNameTableCharCount="16384" />
<reliableSession ordered="true" inactivityTimeout="00:10:00"
enabled="false" />
<security mode="None" />
</binding>
</netTcpBinding>
</bindings>
<client>
<endpoint address="net.tcp://localhost:8888/EmployeeService/tcp"
binding="netTcpBinding" bindingConfiguration="EmployeeService"
contract="EmployeeService.IEmployeeService" name="EmployeeService" />
</client>
</system.serviceModel>
</configuration>
WCF Service class:
[ServiceBehavior(ConcurrencyMode = ConcurrencyMode.Multiple, InstanceContextMode = InstanceContextMode.Single,
AddressFilterMode = AddressFilterMode.Any)]
public class EmployeeService : IEmployeeService
{
private readonly List<Employee> m_Employees = new List<Employee>();
#region IEmployeeService Members
public void AddEmployee(Employee employee)
{
m_Employees.Add(employee);
}
// ... snipped ...
}
What the client does is calling an OperationContract 100 times and benchmark the calls.
var employee = new Employee { ... };
var client = new EmployeeServiceClient("EmployeeService", "net.tcp://localhost:8888/EmployeeService/tcp");
client.Open();
Console.Write("Adding 100 employees...");
var startTime = Environment.TickCount;
for (int i = 0; i < 100; i++)
{
client.AddEmployee(employee);
}
var timeTaken = Environment.TickCount - startTime;
Console.WriteLine(" Done.");
Benchmark result:
.NET 4.0 = 62 ms
Mono 2.11.1 = 1672 ms
Mono 2.10.9 in Debian 6 running in VM = 9632 ms (CPU usage hovering around 1%)
What can I do to speed up the performance of WCF on Mono esp in Debian?

WCF Authentication NT Challenge response

How can I get my console app to connect with an IIS hosted WCF service when basic and/or windows authentication is switched on and anonymous authentication turned off?
The site is internal and stringent security is not required. There is no domain controller. However, I need to turn off anonymous access.
I have searched for days and have tried many methods including using a self hosted certificate and overriding the certification validation, overriding the UserNameValidator and using client.ClientCredentials.Windows.ClientCredentials.UserName or client.ClientCredentials.UserName.UserName. None of these have worked.
I am at a point where it would be nice if someone would be so kind as to look and run the code and help me get the sample running with authentication.
I have taken the liberty of uploading a sandbox solution containing, HostWebSite, ClientConsole and API projects.
I have hosted the zip file on my Windows Live SkyDrive: WCF_Authentication.zip
Some small setup steps.
I added to the hosts file 127.0.0.1 hostwebsite.local
I added a website to IIS
-- location: HostWebSite project root,
-- binding: hostwebsite.local
-- app pool: Classic 4.0 app pool.
Applied security Everyone read access to the HostWebSite project directory.
Verify can see service http://hostwebsite.local/services/EchoService.svc
Verify the console echoes back hello world.
Then turn off anonymous via IIS / Authentication and turn on either basic and/or windows authentication.
thank you
For the benefit of readers, I have included code snippets here
Project: API
namespace API.Contract
{
[ServiceContract]
public interface IEcho
{
[OperationContract]
string SendEcho(string message);
}
}
namespace API.Proxy
{
public class EchoProxy : IEcho
{
public string SendEcho(string message)
{
return string.Concat("You said: ", message);
}
}
}
namespace API.Service
{
[System.Diagnostics.DebuggerStepThroughAttribute()]
[System.CodeDom.Compiler.GeneratedCodeAttribute("System.ServiceModel", "4.0.0.0")]
public class EchoService : System.ServiceModel.ClientBase<IEcho>, IEcho
{
public EchoService()
{
}
public EchoService(string endpointConfigurationName) :
base(endpointConfigurationName)
{
}
public EchoService(string endpointConfigurationName, string remoteAddress) :
base(endpointConfigurationName, remoteAddress)
{
}
public EchoService(string endpointConfigurationName, System.ServiceModel.EndpointAddress remoteAddress) :
base(endpointConfigurationName, remoteAddress)
{
}
public EchoService(System.ServiceModel.Channels.Binding binding, System.ServiceModel.EndpointAddress remoteAddress) :
base(binding, remoteAddress)
{
}
public string SendEcho(string message)
{
return base.Channel.SendEcho(message);
}
}
}
Project: ClientConsole
static void Main(string[] args)
{
EchoService client = new EchoService("WSHttpBinding_IEcho");
try
{
Console.WriteLine(client.SendEcho("Hello World"));
client.Close(); // i tried putting this in the finally block but the client would close in an errored state it said.
}
catch (Exception ex)
{
Console.WriteLine(ex.Message);
}
finally
{
}
Console.WriteLine("Press any key to exit.");
Console.ReadKey();
}
Client Config
<system.serviceModel>
<bindings>
<wsHttpBinding>
<binding name="WSHttpBinding_IEcho" closeTimeout="00:01:00" openTimeout="00:01:00"
receiveTimeout="00:10:00" sendTimeout="00:01:00" bypassProxyOnLocal="false"
transactionFlow="false" hostNameComparisonMode="StrongWildcard"
maxBufferPoolSize="524288" maxReceivedMessageSize="65536"
messageEncoding="Text" textEncoding="utf-8" useDefaultWebProxy="true"
allowCookies="false">
<readerQuotas maxDepth="32" maxStringContentLength="8192" maxArrayLength="16384"
maxBytesPerRead="4096" maxNameTableCharCount="16384" />
<reliableSession ordered="true" inactivityTimeout="00:10:00"
enabled="false" />
<security mode="Message">
<transport clientCredentialType="Windows" proxyCredentialType="None"
realm="" />
<message clientCredentialType="Windows" negotiateServiceCredential="true"
algorithmSuite="Default" />
</security>
</binding>
</wsHttpBinding>
</bindings>
<client>
<endpoint address="http://hostwebsite.local/Services/EchoService.svc/services/EchoService.svc"
binding="wsHttpBinding" bindingConfiguration="WSHttpBinding_IEcho"
contract="API.Contract.IEcho" name="WSHttpBinding_IEcho">
<identity>
<servicePrincipalName value="host/mikev-ws" />
</identity>
</endpoint>
</client>
</system.serviceModel>
Project: HostWebSite
<system.serviceModel>
<!-- SERVER -->
<behaviors>
<serviceBehaviors>
<behavior name="MyServiceTypeBehaviors">
<serviceMetadata httpGetEnabled="true" />
<serviceDebug includeExceptionDetailInFaults="true" />
</behavior>
</serviceBehaviors>
</behaviors>
<services>
<service name="API.Proxy.EchoProxy" behaviorConfiguration="MyServiceTypeBehaviors">
<endpoint address="/services/EchoService.svc" binding="wsHttpBinding" contract="API.Contract.IEcho" />
<endpoint contract="IMetadataExchange" binding="mexHttpBinding" address="mex"/>
</service>
</services>
<serviceHostingEnvironment multipleSiteBindingsEnabled="true"/>
</system.serviceModel>

Are you really looking at message level security? From your description, it appears that you want a transport level security (from IIS). For that you have to get your client configuration file correct. For example,
<binding ...
...
<security mode="TransportCredentialOnly">
<transport clientCredentialType="windows" proxyCredentialType="None" realm="" />
...
This will ensure integrated windows authentication - will use current windows user running the client for authentication. For NTLM/BASIC authentication, you need to provide user name/password from code - for example,
<binding ...
...
<security mode="TransportCredentialOnly">
<transport clientCredentialType="Ntlm" proxyCredentialType="None" realm="" />
And in code,
EchoService client = new EchoService("WSHttpBinding_IEcho");
client.ClientCredentials.Windows.ClientCredential = new System.Net.NetworkCredential(userName, pwd);
EDIT:
For basic authentication to work with http protocol, you have to do configuration on server side as well as. For example,
<system.serviceModel>
<!-- SERVER -->
<bindings>
<basicHttpBinding>
<binding name="NewBinding">
<security mode="TransportCredentialOnly">
<transport clientCredentialType="Basic" />
</security>
</binding>
</basicHttpBinding>
</bindings>
...
<services>
<service name="API.Proxy.EchoProxy" ...
<endpoint binding="basicHttpBinding" bindingConfiguration="NewBinding" contract="API.Contract.IEcho" />
...
See this article for more info. BTW, you may want to consider HTTPS scheme because basic auth transmits password in plain text.

The remote server returned an unexpected response: (400) Bad Request while streaming

I have problem with streaming. When I send small file like 1kb txt everything is ok, but when I send larger file like 100 kb jpg or 2gb psd I get:
The remote server returned an unexpected response: (400) Bad Request.
I'm using windows 7, VS 2010 and .net 3.5 and WCF Service library
I lost all my weekend on this and I still see this error :/ Please help me
Client:
var client = new WpfApplication1.ServiceReference1.Service1Client("WSHttpBinding_IService1");
client.GetString("test");
string filename = #"d:\test.jpg";
FileStream fs = new FileStream(filename, FileMode.Open);
try
{
client.ProcessStreamFromClient(fs);
}
catch (Exception exception)
{
Console.WriteLine(exception);
}
app.config:
<?xml version="1.0" encoding="utf-8" ?>
<configuration>
<system.serviceModel>
<bindings>
<basicHttpBinding>
<binding name="StreamedHttp" closeTimeout="10:01:00" openTimeout="10:01:00"
receiveTimeout="10:10:00" sendTimeout="10:01:00" allowCookies="false"
bypassProxyOnLocal="false" hostNameComparisonMode="StrongWildcard"
maxBufferSize="65536000" maxBufferPoolSize="524288000" maxReceivedMessageSize="65536000"
messageEncoding="Text" textEncoding="utf-8" transferMode="Streamed"
useDefaultWebProxy="true">
<readerQuotas maxDepth="0" maxStringContentLength="0" maxArrayLength="0"
maxBytesPerRead="0" maxNameTableCharCount="0" />
<security mode="None">
<transport clientCredentialType="None" proxyCredentialType="None"
realm="" />
<message clientCredentialType="UserName" algorithmSuite="Default" />
</security>
</binding>
</basicHttpBinding>
</bindings>
<client>
<endpoint address="http://localhost:8732/Design_Time_Addresses/WcfServiceLibrary2/Service1/"
binding="basicHttpBinding" bindingConfiguration="StreamedHttp"
contract="ServiceReference1.IService1" name="WSHttpBinding_IService1" />
</client>
</system.serviceModel>
</configuration>
And Wcf ServiceLibrary:
public void ProcessStreamFromClient(Stream str)
{
//error occuring even this method is empty
using (var outStream = new FileStream(#"e:\test.jpg", FileMode.Create))
{
var buffer = new byte[4096];
int count;
while ((count = str.Read(buffer, 0, buffer.Length)) > 0)
{
outStream.Write(buffer, 0, count);
}
}
}
App.config
<?xml version="1.0" encoding="utf-8" ?>
<configuration>
<system.web>
<compilation debug="true" />
</system.web>
<!-- When deploying the service library project, the content of the config file must be added to the host's
app.config file. System.Configuration does not support config files for libraries. -->
<system.serviceModel>
<bindings>
<basicHttpBinding>
<binding name="Binding1"
hostNameComparisonMode="StrongWildcard"
maxBufferSize="65536000"
transferMode="Streamed"
bypassProxyOnLocal="false"
closeTimeout="10:01:00"
openTimeout="10:01:00" receiveTimeout="10:10:00" sendTimeout="10:01:00"
maxBufferPoolSize="524288000" maxReceivedMessageSize="65536000" messageEncoding="Text"
textEncoding="utf-8" useDefaultWebProxy="true" allowCookies="false">
<security mode="None" />
</binding>
</basicHttpBinding>
</bindings>
<client />
<services>
<service name="WcfServiceLibrary2.Service1">
<host>
<baseAddresses>
<add baseAddress="http://localhost:8732/Design_Time_Addresses/WcfServiceLibrary2/Service1/" />
</baseAddresses>
</host>
<!-- Service Endpoints -->
<!-- Unless fully qualified, address is relative to base address supplied above -->
<endpoint address="" binding="basicHttpBinding" contract="WcfServiceLibrary2.IService1">
<!--
Upon deployment, the following identity element should be removed or replaced to reflect the
identity under which the deployed service runs. If removed, WCF will infer an appropriate identity
automatically.
-->
<identity>
<dns value="localhost"/>
</identity>
</endpoint>
<!-- Metadata Endpoints -->
<!-- The Metadata Exchange endpoint is used by the service to describe itself to clients. -->
<!-- This endpoint does not use a secure binding and should be secured or removed before deployment -->
<endpoint address="mex" binding="mexHttpBinding" contract="IMetadataExchange"/>
</service>
</services>
<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 -->
<dataContractSerializer maxItemsInObjectGraph="2147483647"/>
<!-- 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>
</system.serviceModel>
</configuration>

Try setting:
<serviceDebug includeExceptionDetailInFaults="true" />
It will not solve the problem, but you may get an error message stating what the problem is.