Hi everyone. I have this problem where my flex viewer apps ask for login credentials on seemingly random mornings and the only way I can make it stop is by restarting the arcgis server process. I have no services that are secure so why would it do this? The event logs doesn't seem to produce anything useful either. What other things could be occurring to make the login screen appear on random days?
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I have seen this a time or two that ArcGIS Server has some internal error/issue and all the sudden sets a map service or all the map services as secured, and like you said you restart ArcGIS Server service and all if fine. I have not seen this issue since I have been on 10.2.2 though.