My C# .net 4.5 asp.net app currently uses forms authentication. We need to implement SSO on it via an on-premises ADFS 3.0 server that will link to external ADFS servers using Claims Provider Trusts.
The thing is that some users will continue logging in the old Forms Auth way while others will be authenticating using their ADFS credentials.
Can ADFS and Forms Auth be mixed? How can I direct the different users to the different logins?
I read here that I might need to code my own Custom Auth Provider...this seems pretty complicated. Is there another simpler way?