ASP.NET Core Identity External OIDC Error Handling

Handling OpenID Connect error events in ASP.NET Core

Implement ASP.NET Core OpenID Connect with Keycloak to implement Level of Authentication (LoA) requirements

Setup

Migrations

Add-Migration "InitializeApp" -Context ApplicationDbContext

Update-Database -Context ApplicationDbContext

History

• 2025-07-02 Updates packages
• 2025-05-31 Updated packages
• 2025-05-17 Added LoA
• 2025-05-14 Initial version

Links

https://www.keycloak.org/docs/latest/server_admin/index.html#features

https://learn.microsoft.com/en-us/aspnet/core/security/authentication/configure-oidc-web-authentication

https://docs.duendesoftware.com/identityserver/fundamentals/openid-connect-events/

https://learn.microsoft.com/en-us/dotnet/api/microsoft.aspnetcore.authentication.openidconnect.openidconnectevents

https://datatracker.ietf.org/doc/html/rfc9126