Building Custom Authentication in ASP.NET Core - Hands-On with RemoteAuthenticationHandler
October 16, 2025
10 EST / 16:00 CEST / 14:00 UTC
Overview:
Want to go beyond the built-in authentication handlers in ASP.NET? In this session, Robert Folkesson and Elin Fokine from Active Solution will break down what a RemoteAuthenticationHandler is: the moving parts, how it extends the ASP.NET authentication pipeline, and why you might build one yourself. They'll then demonstrate how they've used this approach in Active Login, their open-source project for integrating Swedish BankID. Finally, we'll plug it into Duende IdentityServer to illustrate how custom handlers can enable flexible identity federation scenarios.
What you'll learn:
This presentation and demonstration will provide a comprehensive look at how to extend ASP.NET's authentication pipeline for specialized use cases. You'll leave with a clear mental model of how RemoteAuthenticationHandler works — and patterns you can reuse to build your own custom authentication flows.
Speakers:
Elin is a consultant at Active Solution (www.activesolution.se), where she helps customers improve their business with Microsoft technologies. She has over 15 years of experience in software development and enjoys problem solving and exploring new technologies. Elin is also the lead developer of Active Login, an open-source package that enables seamless integration of Swedish BankID authentication in .NET.
Robert has over 25 years of experience building Internet-based solutions, including his work as an architect at Microsoft. He was one of the originators of the Active Login open-source project. At Active Solution, Robert focuses on architecture for secure and scalable cloud solutions, with a long-standing emphasis on web-based security, identity, and authentication.