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I am trying to run a program after enabling X windows port forwarding.

My sshd_config file in /etc/ssh/sshd_config is configured such that:

X11Forwarding yes
X11DisplayOffset 10
X11UseLocalhost yes

and my ssh_config file in /etc/ssh/ssh_config has:

Host *
ForwardAgent yes
ForwardX11 yes

I try to enable X Windows port forwarding with

lemon:~ # ssh -X localhost
lemon:~ # echo $DISPLAY

lemon:~ # /usr/bin/SMclient
xdpyinfo:  unable to open display "".
Unable to launch GUI due to X server display setting problem, Exiting .

So $DISPLAY is set to nothing. I have tried everything I've seen online. Originally there was no .Xauthority file so I copied from /var/run/gdm/auth-for--/database and renamed the file .Xauthority

I then tried 

lemon:~ # xauth generate :0 . trusted
Invalid MIT-MAGIC-COOKIE-1 keyxauth: (argv):1:  unable to open display ":0".

When this didn't work, I deleted the old .Xauthority file and then:

lemon:~ # touch ~/.Xauthority
lemon:~ # xauth generate :0 . trusted
No protocol specified
xauth: (argv):1:  unable to open display ":0".

And many others suggested to run host + which just leads to

lemon:~ # xhost +
xhost:  unable to open display ""
CrazyCray
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  • Fiddling with `.Xauthority` and `xhost` is pointless because that's not where you have a problem (but be careful, your fiddling may have caused another problem, depending on what you've ended up with in `.Xauthority`). These are about authorizing the connection to the display, but you don't have a display to connect to. You need to figure out why `DISPLAY` is not set. Do you have anything that changes `DISPLAY` in your startup file (`/etc/profile`, `~/.bashrc`, `~/.profile`, `~/.bash_profile`, …)? If so remove it. – Gilles 'SO- stop being evil' Aug 08 '17 at 22:50
  • Can you still run X programs without going through SSH? (Your fiddling may have broken that. If so I suggest you log out and back in.) What does `echo $DISPLAY; ssh -X localhost 'echo $DISPLAY'` show? – Gilles 'SO- stop being evil' Aug 08 '17 at 22:52
  • What distro are you using? – Jakuje Aug 09 '17 at 11:07
  • Did you try `export DISPLAY=:0.0" ? – Noam Manos Jan 17 '20 at 11:12
  • @Gilles'SO-stopbeingevil', I have a similar question for which I can't find an answer. You seem to know this subject well, is there any chance you wouldn't mind taking a look at it? https://unix.stackexchange.com/questions/630428/invalid-mit-magic-cookie-1-when-i-run-mpirun (My apologies for my bad manners in asking this in this way. I don't usually do this but I am a bit desperate.) – Kvothe Jan 22 '21 at 18:25

1 Answers1

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Along with all the above on macOS13 Ventura you must: In System Settings, General, Allow in Background, XQuartz must be turned on.

Mike
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