The ArcGIS online help system states the following :
“ArcGIS Online supports ArcGIS Server authentication (not Web Tier authentication) for adding and accessing secure services.”
I have to say that the statement is a bit confusing to me since I am able to add secured services from ArcGIS Servers secured using Web Tier Authentication and I don’t run into any problems. Can anyone clarify what this statement really means ? Is web tier authentication not really supported or I am missing something ? Many clients out there use web tier authentication for single sign and integration with other corporate systems.