In My silverlight webresourc I was consuming WCF component to fetch data from external database. when I deployed this webresource to CRM 2011, I got below error
In order to solved this issue I placed crossdomain.xml and clientaccesspolicy.xml in root folder of my WCF component “C:\inetpub\wwwroot”
you can refer http://msdn.microsoft.com/en-us/library/cc197955%28v=vs.95%29.aspx for more details on crossdomain and clientaccesspolicy xml.
Hope it will help somebody.