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Larry,
Do you have a crossdomain.xml file on your ArcGIS Server? See the documentation on it here:
http://resources.arcgis.com/en/help/flex-api/concepts/017p/017p0000001w000000.htm
Also for future reference you need to post Flex Viewer questions to the Flex Viewer forum here:
http://forums.arcgis.com/forums/111-ArcGIS-Viewer-for-Flex
Don't forget to click the Mark as answer check on this post and to click the top arrow (promote).
Follow the steps as shown in the below graphic:
Larry,
Install an http utility like Fiddler or firebug so you can see the http requests that are failing and the possible reason why.
Robert,
Thanks for the help, I have been testing with firebug and it is very useful. I solved that error but am receiving a new one shown in the attached photo. I added the proxy url in the flex viewer settings, but it appears the rest services is pointing to the name of the server (http://myserver:6080/rest), should it be pointing to the actual ip address (http://192.268.10.48:6080/rest)? In the capabilities of the map and feature service it is not allowing the rest service to be changed, is there another way to do this, or is it something else?
Thanks,
Larry