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i will use data config for authentication
The best way to keep authenticated user around many asp . net application is by using sessions.
Maintain data in database. While loading page, keep them in session variable. on logout / website close, dispose the session.
i will use sticky session.
Windows authentication or by using single sign on (SSO) authentication
Session is good. But session variables need to be used carefully in today's tabs based browsers. As tab uses same sessions may end up in some dirty reading writing issues.
i will use redis. it will help u also to scale your application by adding as many server u want.