Silverlight 4 Client with ASP.NET 3.5 ADO.NET Web Services

In my corporate enterprise environment, server upgrades are slow. We have developed an application with SL 4, using the System.Data.Services.Client namespace to consume a .NET 3.5 ADO.NET Webservice.

I am receiving a consistent 404 Error. I've spent the last week working through the issue. The client allows specification of the OData Protocol Version (Ver 1 or Ver 2), however changing these issues does not rectify the problem.

Given that ADO.NET Data Services are designed to confirm to the OData Standard, my guess is that the HTTP GET request is somehow different in SL 4, than in SL 3. However, I have not confirmed this due to restrictions on access to corporate servers.

Has anyon开发者_运维百科e else tried to use the SL4 Dataservice Context (System.Data.Services.Client) to access an ADO.NET 3.5 Data Service?