Problem connecting to an Windows WebDAV share


im trying to connect to a Windows-Server Share via WebDAV and External Storage
I created a Website on my Windows Server and linked it to an directory called “FreigabeTest”, WebDAV enabled.

I did everything like this tutorial (sorry its in german:

Now i try to connect via Nextcloud but everytime an error occurs.

This is my configuration (deleted unreleveant data, but everything is correct!)

Thank you for your help

Nobody has an idea? :scream: