I would like to provide a solution to maintaining login state over multiple calls to my .NET web service layer. So basically, the user logs in, then stores a login "token" internally on the Flex side so that each web service call can be authenticated as being made by someone who has already "logged in" to the system. Does anyone have any ideas on how to approach this? My initial approach was to cache the user's username/password and authenticate on each web service call (Direct Authentication). I was told, for obvious reasons, that this is insecure method and requires database hit each call. I am trying to implement WSE 3.0 enabled web services on the .NET side. Is this an SSO problem, or should I be using STS/Brokered Authentication approach? We just started our upgrade to VS2008, so maybe I should just pursue WCF methods instead? Any experiences with this would be greatly appreciated.
TIA, variable

