I too am having the same issue. My arcgis server is at version 10.01, but when my flex app attempts to call getLegendInfos on a layer the requests is trying to go through arcgis.com to get legend information. I can view the JSON response for my service through the rest legend endpoint in my browswer, so that seems to be working. Why are flex calls trying to go through arcgis.com. I have cleared the rest cache, and my browswer cache, neither of those resolved the issue.
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