VNC - simple test with vnc (x11vnc and ssvnc)

I am trying to set up a vnc connection between 2 computers, but am having trouble so far. In order to **understand the concept**, I am now simply trying to start a vnc server (using x11vnc) and connect to it using ssvnc **on the same computer** This page supposedly explains how to do so. Apparently, starting a vnc server should be as simple as downloading x11vnc and using the command x11vnc -display :0 The same page also contains a link to download ssvnc, that can be used as a vnc client (link here for your convenience ) It states that in order to connect using the vnc client, suffice to unpack the tar.gz directory, then run ./ssvnc/Unix/ssvnc. Then, I start ssvnc and type in user@localhost such as follow: However when i press connect, a xterm windows appears, with the following message: The x11vnc docs mentions that a common gotcha is to set the Xauth - I tried to do that by re-running the server with x11vnc -display :0 -auth /home/user/.Xauthority But I received the same error message. Anyone can help me out here with that basic test / problem?