Ubuntu
openssh package

blank line response to "echo $DISPLAY" - No remote X capability

Asked by Mark Garrow

This scenario is all on my local LAN. All machines are on the same subnet etc.. I ssh from my ubuntu gnome laptop to my kubuntu desktop using "ssh -X <name@IP Address>" .. after logging in I issue the command "echo $DISPLAY" and get a blank line as a response. I've checked /etc/ssh/sshd_config and /etc/ssh/ssh_config and changed the X11Forwarding no... to... X11forwarding yes. I've restarted ssh, tried logging out and back in, and rebooted the machine entirely with no response to the echo $DISPLAY command... This does work locally on the kubuntu machine however.

All this is to try getting remote X to work.

Any hints, tips, how-to's are welcome. If I've left anything out please let me know and I'll provide answers.

Thanks,
Mark / Scunizi

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George Standish (george-standish-deactivatedaccount) said : 		#1

If you have access to the local machine test ssh's X forwarding locally.

   locally when i run "echo $DISPLAY" it returns: :0.0
   when i try to connect with "ssh localhost" and login when i run "echo $DISPLAY" it's blank
   when i try to connect with "ssh -X localhost" and login when i run "echo $DISPLAY" it returns: localhost:10.0

Something to test anyways, best of luck,
George

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Mark Garrow (scunizi) said : 		#2

Thanks for your response George. Logging in using localhost has the same results... a blank line. If I'm at a simple CLI prompt (no ssh involved) the response to "echo $DISPLAY" is .... :0.0

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George Standish (george-standish-deactivatedaccount) said : 		#3

Verify that sshd is forwarding X.

$ cat /etc/ssh/sshd_config | grep X
X11Forwarding yes
X11DisplayOffset 10

Good luck,
George

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Mark Garrow (scunizi) said : 		#4

Thanks George.. I mentioned those settings in the original post.. I did verify them again and they are set correctly.

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George Standish (george-standish-deactivatedaccount) said : 		#5

Well I'm fresh out of ideas. Hopefully someone else has some input. Best of luck,
George

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