Not possibe to run Shiboleth correct on IIS WindowsServer 2019

[Cantor, Scott]

There is no "filter" anymore, the modern IIS extension is a module and it automatically picks up requests for handlers without the old script extension trick.

A 404 means the module is simply not there and/or not active for the site in question, or you're trying to issue handler requests over http without changing default settings that require TLS. If you want more insight, that's in the native log stream.

The metadata handler is deprecated as it says it is, and I don't know what else you want there. Ignore the warning or remove it from the configuration.

-- Scott