If your ArcGIS Map Web Part is not hosted on the same server or domain as the data (services) you are accessing, you need a clientaccesspolicy.xml file on the remote server. For additional information, read the topic Making a Service Available Across Domain Boundaries. For more information on the structure and function of a clientaccesspolicy.xml file, read the topic Network Security Access Restrictions in Silverlight. As an example, you can also view the policy file used by ArcGIS Online:http://services.arcgisonline.com/clientaccesspolicy.xml.
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