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xhost +.xhostis from a gentler era when having a machine connected to the network meant you were trustworthy.xhost +means anyone who can spoof your IP can take control of your X server session.ssh -Xwill set up all the required authorizations. If X11 forwarding disabled in the server config, talk to your administrator; if that doesn't work, see Forwarding X11 over SSH if the server configuration doesn't allow it.~/.ssh/configand/etc/ssh/sshd_configin the same place. I could not tell if they were different' files or just a change in nomenclature..Xauthorityfile. If using Red Hat or other system with SELinux, check the SELinux context, see unix.stackexchange.com/questions/36540/…ssh -Xrunxterm &to get a graphical terminal as the ultimate test to see if it's working.