As the weekend goes by…
I’m still interested in a command to raise the debug-level on these containers. Or is there even a general one somebody knows of?
On the other hand - with just the two or three klicks - I installed the app on my ucs member-server and - voilà - it just works…
The errors above are from a slave-server with samba4.
So actually, yes: I do have working connections to windows10 through rpc (nla) and to tightvnc on debian through vnc and there are scenarios where this guacamole isn’t just healthy food 
Best,
Bernd