All, I noticed this issue as well - in the previous version of ArcGIS Explorer Online I was able to do this, but it seems something in the upgrade now causes this to fail. We tested the request with Fiddler and discovered the following: It seems AGX Online uses a proxy in order to get to internal resources. For example, we have an internal server called TESTDEV that has a map service at http://testdev.esri.com/ArcGIS/rest/services/KIF/MapServer. When accessed through the normal Javascript web map it fetches tiles directly from the REST endpoint. When accessed through ArcGIS Explorer it attempts to call the following: http://www.arcgis.com/sharing/proxy?http://testdev.esri.com/ArcGIS/rest/services/KIF/MapServer?f=json but fails with the following error: HTTP Status 500 - server encountered an internal error () that prevented it from fulfilling this request. Does anyone know why this happens? Thanks, Pete
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