Summary
                    
                    
                
                    The instructions provided describe how to add an internal ArcGIS Server service to ArcGIS Explorer Online.
                
                
                
                
                
                
                    
                     
                        Procedure
                    
                    
                    
- Open Windows Explorer and navigate to C:\inetpub\wwwroot.
 - In the wwwroot folder, create a new text document and name it 'clientaccesspolicy.xml' if one does not already exist.
 - Open the new 'clientaccesspolicy.xml' file and use the Network Security Access Restrictions in Silverlight documentation to populate the file. 
Note:
The policy file used by ArcGIS Online is a good example of this type of file: https://services.arcgisonline.com/clientaccesspolicy.xml.
 - Open a web browser, navigate to ArcGIS Online, and click My Content.
 - Click Add Item, and select On the Web from the 'The Item is' dropdown menu.
 - Enter a fully qualified name for the service.
Note:
For example, type
https://myserver.esri.com/arcgis/rest/services/USA/MapServer
 instead of 
https://myserver/arcgis/rest/services/USA/MapServer
 - Navigate to ArcGIS Explorer Online, and the newly added service is available for viewing in the My Content section under Add Content.