Warning: Request for cross-domain policy at '<URL>' timed out
The connection to the specified URL timed out when the application was searching for a cross-domain policy file.
If a Silverlight 5 application needs to access a service in another domain, the service must explicitly opt in to enable cross-domain access. By opting in, a service affirms that the operations it exposes can safely be invoked by a Silverlight 5 control, without potentially damaging consequences to the data that the service stores.
To correct this error
Verify that your Internet connection is working by browsing to a different URL.
Attempt to update the service reference. In Solution Explorer, right-click the service reference and then click Update Service Reference.
A progress dialog box is displayed when the reference is being updated from its original location, and the service client is regenerated to reflect any changes in the metadata.
Verify that either a clientaccesspolicy.xml file or a valid crossdomain.xml file exists at the root of the domain in which the service is hosted.