DLNA problem: 401 Unauthorized

Hi all,

I'm running Logitech Media Server Version: 7.9.1 - 1508904967 on a
Debian GNU/Linux unstable box for years. I'm successfully using
ShairTunes and now I wanted to get streaming from Windows 10 via DLNA
media streaming working as well.

I've activated Andy Grundman's UPnP/DLNA Media Interface (v1.0) and
also set the UPnP/DLNA-Client to "Yes, search for UPnP/DLNA media
servers" (whatever the English dropdown entry is called).

However, when I use the "Send to <Touch>" submenu from Windows File
Explorer, the media window on Windows opens, the Touch in question
displays the track metadata, but then I get a popup "401 Unauthorized".

The server.log has multiple entries:

Slim::Plugin::RemoteLibrary::UPnP::ControlPoint::_ gotError (279) Error
retrieving device description: 404 Not Found

What am I missing?

Greetings,
Stefan

--
Stefan Bellon