Cross-domain policy problem with ASP.NET SilverLight WCF service 19 October 2009 bryiantan (9) An error occurred while trying to make a request to URI This could be due to attempting to access a service in a cross-domain way without a proper cross-domain policy in place, or a policy that is unsuitable for SOAP services. You may need to contact the owner of the service to publish a cross-domain policy file and to ensure it allows SOAP-related HTTP headers to be sent. This error may also be caused by using internal types in the web service proxy without using the InternalsVisibleToAttribute attribute. Please see the inner exception for more details. Silverlight WCF Exception Cross-domain policy problem with WCF service Solution: Silverlight clientaccesspolicy.xml files for the Enterprise (Part 1 of 2) Silverlight Cross Domain Access