Kestrel supports only user-mode authentication. Http.Sys operates as a shared kernel mode component with the following features that kestrel does not have: Extensibility that allows for protocols like PPv2 and alternate transports.Programmatic port and TLS configuration.Agility, it's developed and patched independent of the OS.Better performance and memory utilization.Kestrel has the following advantages over HTTP.sys:

For more information, see ASP.NET Core Module (ANCM) for IIS. The ASP.NET Core Module is a native IIS module that handles native IIS requests between IIS and the in-process IIS HTTP Server or Kestrel. In a process separate from the IIS worker process (the out-of-process hosting model) with the Kestrel server.In-process is the recommended configuration. In the same process as the IIS worker process (the in-process hosting model) with the IIS HTTP Server.When using IIS or IIS Express, the app either runs: HTTP.sys server is a Windows-only HTTP server based on the HTTP.sys kernel driver and HTTP Server API.IIS HTTP Server is an in-process server for IIS.Kestrel provides the best performance and memory utilization, but it doesn't have some of the advanced features in HTTP.sys. Kestrel server is the default, cross-platform HTTP server implementation.

Local web server mac