You might try removing the line <domain uri="*"/>, but I don't think that's your problem. The only reasons I can think of that Silverlight is not requesting the xml file is 1) you're requesting a resource which is not a well formed URI, and 2) the resource appears to be in the same domain as your application. I would guess that your problem is #1. Can you post the actual (or slightly adjusted) URI to your service, including the domain suffix?