Asking for help, clarification, or … 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. ERROR MESSAGE FOR GEDIT: (gedit:3058): Gtk-WARNING **: cannot open display: localhost:10.0 The package xorgs-x11-apps provides the xclock command. then xhost + I get xhost: unable to open display “IP:0.0” when I try export DISPLAY=”:0.0″ I get the same thing. P.S: if xhost +your-username doesn't work try I have a desktop and a server both running CentOS 7.5 and I run ssh -X from desktop to the server. I have a haunch that it security related but I lack the right knowledge to debug it. Introduction to xclock:. If you still get the “cannot open display” error, set the DISPLAY variable as shown below. Please be sure to answer the question.Provide details and share your research! DISPLAY is set to localhost:10.0 for both user1 and user2. Thanks for contributing an answer to Stack Overflow! 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 ? Open GUI applications in that host. But avoid …. I have been testing mostly by trying to run xclock. These results tells me that the display argument is getting to xclock. You will not be able to display graphics on the screen. I have CentOS6.4 running on a late model Dell Blade Windows8 Alienware laptop And it had something to do with .Xauthority or some such. $ export DISPLAY='IP:0.0' I do remember having seen the "Can't display" issue long time ago. in the terminal, that is how I solved my problem. Installing the package providing the xclock command. When I put export DISPLAY=”IP address:0.0″ ip address being my windows8 desktop. – eucap Sep 12 '12 at 8:11 ERROR MESSAGE FOR XCLOCK: Error: Can't open display: localhost:10.0 ERROR MESSAGE FOR MATLAB: Warning: Unable to open display 'localhost:10.0'. 1. 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. 3. $ 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. Check the package which provides the binary, using below command: Using ssh -Y makes no difference. 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. X11Forwarding yes X11DisplayOffset 10 X11UseLocalhost yes I performed steps what you have told.Didnt set the Display in putty .Enabled forwarding . ; This package is not a part of the Xorg katamari and is provided only as a dependency to other packages or for testing the completed Xorg installation. usually export to DISPLAY solved the problem. In Linux, the xclock package contains a simple clock application which is used in the default xinit configuration. In sshd_config I have. I'm trying to open GUI installation from shell without success so I tried first to open just xclock but was unable as well. 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