Are there any .NET solutions for central authentication service?

Question

Before I invent the wheel, are there any .NET implementations of the central authentication service? I have a need to authenticate users on one site for different other sites, all under my control. It’s not very difficult, but I just wanted to see what was there. The preferred version is MVC.

Answer 1

http://www.codeproject.com/Articles/106439/Single-Sign-On-SSO-for-cross-domain-ASP-NET-applic

Well explained with sample code, FYI.

You can also refer: SSO library on asp.net C #