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Jun 02, 2012 01:09 PM|LINK
This is not supported by ASP.NET. To acheiev this there are a lot of hacky workarounds -- search in this forums and I'm sure you'll find 10 other posts that give 20 different ways to do it :)
The way I'd suggest is to use forms authentication in the app and then have two different endpoints that the users can use to login depending on which type of authentication is required for that user.