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    Thanks. Did you create the diagram? Very impressive, an takes me a while to read. When I run DISPLAY=192.168.1.198:0 eog, it says Unable to init server: Could not connect: Connection refused. How shall I make it work? Do I need to make the X server on the remote host accept TCP connection? Commented Mar 13, 2019 at 10:16
  • If that IP is your remote Host's IP. It simply because your there's no x server listening on tcp:192.168.1.198:6000. @Tim If you want that to work, you have multiple solution, safe or not safe, simple or not simple. Commented Mar 13, 2019 at 14:57
  • Yes, I created the diagram (might use it for some future trainings). As written in the terminal 3 example (direct X11 connection across servers), theres two primary things to do: Your firewall needs to be opened (in your case allowing connections to tcp:192.168.1.198:6000, as 炸鱼薯条德里克 wrote), and you need to look up how to configure X11 permissions with e.g. xhosts. This assumes that a working X server is running on 192.168.1.198, so DISPLAY=192.168.1.198:0 eog should work if executed locally on that server. Commented Mar 19, 2019 at 17:53
  • "localhost:10.0" is only redirecting to the local X server, there is no X server started on the ssh-target. What is the target terminal doing without a X11 server? Like how :0 and :1 refer to X-servers (and then Monitor 1 and VNC), 2hat "display" does localhost:10 refer to then? @Folfy Commented Feb 13, 2023 at 21:13
  • Please see drawing and description for terminal 2b and 6b. For X11-Forwarding to make sense, you're supposed to have an X11 Server already running on your ssh-client host, and that's where the X11 traffic is redirected/forwarded to. Commented Feb 14, 2023 at 14:00