Remoting serialization exception??

[ShaneN]

I'm working on a remoting application where the client only references interfaces for all wellknown objects.

I currently have an object, Request being exposed:

Imports System.Runtime.Remoting
Imports System.Runtime.Remoting.Channels
Imports System.Runtime.Remoting.Channels.http
Imports Central.Remotable
 
Public Class SyncService
 
   Protected Overrides Sub OnStart(ByVal args() As String)
      Dim provider As New BinaryServerFormatterSinkProvider()
      provider.TypeFilterLevel = Runtime.Serialization.Formatters.TypeFilterLevel.Full
 
      Dim props As New Hashtable()
      props("port") = 8989
 
      Dim channel As HttpServerChannel = New HttpServerChannel(props, provider)
      ChannelServices.RegisterChannel(channel, False)
 
      RemotingConfiguration.CustomErrorsMode = CustomErrorsModes.Off
      RemotingConfiguration.RegisterWellKnownServiceType(GetType(Request), "Request", WellKnownObjectMode.Singleton)
   End Sub
 
   Protected Overrides Sub OnStop()
   End Sub
 
End Class
 

And my client is configured (using XML) as so:

  <system.runtime.remoting>
    <application>
      <channels>
        <channel ref="http">
          <clientProviders>
            <formatter ref="binary" typeFilterLevel="Full" />
          </clientProviders>
        </channel>
      </channels>
      <client>
        <wellknown 
          type="Central.Interface.Remotable.IRequest, Central.Interface"
          url="http://localhost:8989/Request"
         />
      </client>
    </application>
  </system.runtime.remoting>
 

The problem I'm running into is the Request object returns a structure in Central.Common. Structs that implements an interface in Central.Interfa ce. The client ONLY has a reference to the Central.Interfa ce class library and not the Central.Common. When I run the method on Request that returns the structure, I get a SerializationEx ception telling me that it cannot find the assembly Central.Common. Why would that exception be thrown when the client only points to the interface and expects an object of Central.Interfa ce.Structs.ISta rtReturnStruct?

If you need any more code/details, let me know. I posted a ton already and didn't want to clutter this up any more.

Thanks!