WCF error - connection is closed by remote host - wcf

Question

I have this very strange error...
I am developing on a WCF service, that I've taken over from somebody else. There is a class called User defined like this:
namespace WebApi.DataContracts
{
[DataContract]
public class User
{
[DataMember]
public int Id
{
get;
set;
}
[DataMember]
public string Username
{
set;
get;
}
...
[DataMember]
public DateTime Birth
{
get;
set;
}
[DataMember]
public bool Newsletter
{
get;
set;
}
etc...
I've made a API method, that returns this object as data
namespace WebApi
{
public class SoapApi : IApi
{
public DataContracts.User UserRegister()
{
DataContracts.User u = new DataContracts.User();
return u;
}
}
When I try to call this from a client, I get this error:
[SocketException (0x2746): An existing connection was forcibly closed by the remote host]
System.Net.Sockets.Socket.Receive(Byte[] buffer, Int32 offset, Int32 size, SocketFlags socketFlags) +6132200
System.Net.Sockets.NetworkStream.Read(Byte[] buffer, Int32 offset, Int32 size) +134
[IOException: Unable to read data from the transport connection: An existing connection was forcibly closed by the remote host.]
System.Net.Sockets.NetworkStream.Read(Byte[] buffer, Int32 offset, Int32 size) +300
System.Net.PooledStream.Read(Byte[] buffer, Int32 offset, Int32 size) +26
System.Net.Connection.SyncRead(HttpWebRequest request, Boolean userRetrievedStream, Boolean probeRead) +265
[WebException: The underlying connection was closed: An unexpected error occurred on a receive.]
System.Net.HttpWebRequest.GetResponse() +6038435
ClassLib.HandlerFactory.AjaxProxy.ProcessRequest(HttpContext context) in ClassLib\HandlerFactory.cs:75
System.Web.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() +100
System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously) +75
It looks to me that this line
System.Net.Sockets.Socket.Receive(Byte[] buffer, Int32 offset, Int32 size, SocketFlags socketFlags) +6132200
indicates, that an awful lot of bytes is tried to be sent - why is that?
UPDATE: The binding in my CLIENT web.config is as follows:
<bindings>
<basicHttpBinding>
<binding name="BasicHttpBinding_Api" closeTimeout="00:01:00"
openTimeout="00:01:00" receiveTimeout="00:10:00" sendTimeout="00:01:00"
allowCookies="false" bypassProxyOnLocal="false" hostNameComparisonMode="StrongWildcard"
maxBufferSize="2147483647" maxBufferPoolSize="2147483647" maxReceivedMessageSize="2147483647"
messageEncoding="Text" textEncoding="utf-8" transferMode="Buffered"
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>
<binding name="ApiBinding" closeTimeout="00:01:00"
openTimeout="00:01:00" receiveTimeout="00:10:00" sendTimeout="00:01:00"
allowCookies="false" bypassProxyOnLocal="false" hostNameComparisonMode="StrongWildcard"
maxBufferSize="2147483647" maxBufferPoolSize="2147483647" maxReceivedMessageSize="2147483647"
messageEncoding="Text" textEncoding="utf-8" transferMode="Buffered"
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>
</bindings>
SERVER web.config bindings are:
<bindings>
<basicHttpBinding>
<binding name="ApiBinding" />
</basicHttpBinding>
<webHttpBinding>
<binding name="ApiBinding" />
</webHttpBinding>
</bindings>
/ Carsten

Answer 1

By the information you have provided which seems to be only server side, it is impossible to say what the problem is.
So:
Update the information with the client side detail
Now, the error tells me that there is a binding mismatch or security error happening - although security is set to None. So my hunch based on the info provided is a binding mismatch between client and server possibly security is on for one and off for the other.