Hi there,
hope everybody  is well.
I am trying to set up a connection between the client (Ubuntu 18.04) and a Raspberry running Ubuntu Mate.
SSH via terminal works fine.
When initiating via X2Go the client returns:

" The conection with the remote server was shut down. Please check the state of your network connection".

I have no issues connecting from the same machine to other Ubuntu Mate instances running X2GoServer.

It might be just my stupidity and I am missing something, or something else.
Where does the server or client have more detailed logs to narrow down the issue?
Thank you!