Submit operation failed - NotFound from RIA Services with Silverlight 4 on SubmitChanges()

I'm using SL4 and RIA Services to build a new solution based on the Silverlight Business Application template. Since I'm still developing, I'm just using localhost.

I'm trying to test the SubmitChanges functionality by making a single change in an associated (composition) entity and calling SubmitChanges. I have a breakpoint in my DomainService at the entry point in the Update method. The breakpoint is hit and everything looks okay. At this point, I don't actually have the Update method do anything - it simply returns. In the client-side callback, I check the SubmitOperation object for errors. It reports:

Submit operation failed.  The remote server returned an error: NotFound.

So far I haven't found what wasn't found.

I tried using Fiddler (along with the WCF Binary plugin) and as far as I can tell, the request looks good, but according to Fiddler:

ReadResponse() failed: The server did not return a response for this request. 

Hmm... Well that can't be right because my callback breakpoint was hit. (That's how I got the NotFound error message.)

I also tried editing my web.config file with the following:

<system.serviceModel>
  <serviceHostingEnvironment aspNetCompatibilityEnabled="true" multipleSiteBindingsEnabled="tru开发者_JAVA百科e" />
  <behaviors>
    <serviceBehaviors>
      <behavior name="RIAServiceBehavior">
        <serviceMetadata httpGetEnabled="true" />
        <serviceDebug includeExceptionDetailInFaults="True" />
      </behavior>
    </serviceBehaviors>
  </behaviors>
</system.serviceModel>

That didn't provide any new information. I'm starting to run out of ideas on how to track down the "real" problem. Any ideas??

---

Saurabh and Dan both have good posts on debugging 'Not Found' exceptions.

http://blogs.msdn.com/b/saurabh/archive/2010/03/16/ria-services-application-deployment.aspx

http://blogs.objectsharp.com/post/2010/04/13/WCF-RIA-Services-%E2%80%9CNot-Found%E2%80%9D-Error-Message.aspx

Kyle