[X2Go-Dev] Server running on Raspberry

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!