Introduction to IdentityServer and OpenID-Connect

Today we face many authentication and authorization challenges when we’re designing and developing modern applications. The requirements are more challenging than ever, especially when we need to support everything from mobile and SPA applications, to microservices in the cloud.


OpenID Connect is the de-facto standard we should use for handling authentication and authorization in modern applications. However, it can still be very confusing with all the various concepts, including scopes, claims, flows, resources and tokens.

In this course, you will learn the following:

  • How OAuth and OpenID Connect work together in detail
  • How to set up an instance of IdentityServer
  • How to secure ASP.NET Core applications using OpenID Connect and IdentityServer

When we go through these things, we will not just configure some obscure magic libraries; instead, we will look under the hood of OpenID Connect and IdentityServer to understand what really makes them tick.

We recommend that you have a good computer that can run multiple instances of Visual Studio and at least one big monitor. In this course, we use ASP.NET Core 7 and IdentityServer 6.

After this course, we recommend you look at the course IdentityServer in Production, where we will teach you how to create a production-ready set-up of IdentityServer.

This course contains a lot of hands-on practical exercises where you will learn how to work with OpenID Connect and the latest version of Duende IdentityServer version 6.

Level: Intermediate


  • ASP.NET Core
  • C# (LINQ / Lambda…)
  • The HTTP(S) protocol and how the web works in general
  • HTML

Target audience:

ASP.NET Core developers who want to learn the fundamentals of OpenID Connect and how to protect applications using the latest version of IdentityServer. 

Course content:

  • OAuth 2.1 / OpenID Connect
  • Certificates and HTTPS
  • Token services
  • Duende Identity Server
  • JSON Web Tokens (JWT)
  • Scopes and claims
    • Identity resources
    • API resources
    • APIScopes
  • Securing the tokens
  • Cross-origin resource sharing (CORS)
  • Flows
    • Implicit flow
    • Authorization code flow
    • Client credentials flow
  • Proof Key for Code Exchange (PKCE)
  • External identity providers
  • Application types:
    • Web applications
    • SPA and mobile applications
    • Server-to-server communication
  • ASP.NET Core
    • Authentication
    • Cookie authentication
    • Authorization
    • OpenID Connect
    • Claims transformations

And much more…


About the autor and instructor: Tore Nestenius

Tore has worked as a consultant since 1997 and is a very knowledgeable system developer and has in the past worked for large companies like Ericsson and Flextronics. Early in his career, Tore Nestenius started Programmers Heaven - a portal with over 750 000 monthly users. He’s behind several other successful projects like CodePedia - a Wiki for developers, the Open Source project TNValidate, and the C# School e-book with over 100 000 downloads.

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