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...y file permissions. So really only the user himself can connect to it. I'd guess that's much more secure than relying on .Xauthority protecting the TCP socket. ---> So why not use a UNIX socket for X11 forwarding? P.S. I don't have much experience with Wayland. But it looks like Waypipe is also using UNIX sockets for Wayland forwarding. https://gitlab.freedesktop.org/mstoeckl/waypipe https://mstoeckl.com/notes/gsoc/blog.html You can manually try this out: ssh -R /tmp/.X11-unix/X1:/tmp/.X11-unix/X0 USER at HOST DISPLAY=:1 xterm rm -Iv /tmp/.X11-unix/X1 You have to manually r...