Please be sure to answer the question.Provide details and share your research! I'm trying to open GUI installation from shell without success so I tried first to open just xclock but was unable as well. I do remember having seen the "Can't display" issue long time ago. I have a haunch that it security related but I lack the right knowledge to debug it. Introduction to xclock:. I currently do not have the type of problem you are reporting -- I can ssh -Y (or -x) user1@remote, then su - user2, and I can still run xclock as user2. Check the package which provides the binary, using below command: Installing the package providing the xclock command. Using ssh -Y makes no difference. usually export to DISPLAY solved the problem. Asking for help, clarification, or … X11Forwarding yes X11DisplayOffset 10 X11UseLocalhost yes I have been testing mostly by trying to run xclock. in the terminal, that is how I solved my problem. 3. In that case I can see the xclock without a problem but if I re-edit the /etc/inittab, put "id:5:initdefault:", restart the machine in order to run at level 5 the problem is still there and if you do a ps -ef|grep gdm it is running when the xclock doesn't appear and it is not running when you start the X using the run level 3 and startx command. If you still get the “cannot open display” error, set the DISPLAY variable as shown below. You will not be able to display graphics on the screen. In Linux, the xclock package contains a simple clock application which is used in the default xinit configuration. $ export DISPLAY='IP:0.0' DISPLAY is set to localhost:10.0 for both user1 and user2. xclock is a handy tool to test if the DISPLAY variable is set properly and you can get a GUI based clock on running the “xclock” command as shown below. But avoid …. I have a desktop and a server both running CentOS 7.5 and I run ssh -X from desktop to the server. In sshd_config I have. I have CentOS6.4 running on a late model Dell Blade Windows8 Alienware laptop After opening ssh connection to the remote host as explained above, you can open any GUI application which will open it without any issue. ERROR MESSAGE FOR XCLOCK: Error: Can't open display: localhost:10.0 ERROR MESSAGE FOR MATLAB: Warning: Unable to open display 'localhost:10.0'. These results tells me that the display argument is getting to xclock. $ xclock -display 192.168.0.111:0.1 Error: Can't open display: 192.168.0.111:0.1 $ ping 192.168.0.333 ping: unknown host 192.168.0.333 $ xclock -display 192.168.0.333:0 I would expect it to fail but it also displays on my computer (111) but with a bit of a delay. The package xorgs-x11-apps provides the xclock command. Open GUI applications in that host. P.S: if xhost +your-username doesn't work try And i logged in to the server and set the DISPLAY to localhost:0 .But no errors,but am not able to see the windows of xclock .As i said on one server it worked well.Also can i know where to look for ssh_config file ? Thanks for contributing an answer to Stack Overflow! ERROR MESSAGE FOR GEDIT: (gedit:3058): Gtk-WARNING **: cannot open display: localhost:10.0 – eucap Sep 12 '12 at 8:11 And it had something to do with .Xauthority or some such. ... but running xclock gives Error: Can't open display in two minutes. 1. then xhost + I get xhost: unable to open display “IP:0.0” when I try export DISPLAY=”:0.0″ I get the same thing. I performed steps what you have told.Didnt set the Display in putty .Enabled forwarding . 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