I found a way to make x2x work, I wouldn't call it a solution but it points to what is missing when you get this error. The xauth authority file used when tunneling X through ssh does not have the cookie for the X server.
Setup: - 2 machines, called 'desktop' and 'laptop' where x2x is run on the laptop. - Run 'ssh -XC laptop x2x -east -to :0.0' from desktop - Error seen: 'x2x - error: can not open display :0' >From the desktop: # ssh -X laptop 'xauth info' Authority file: /home/user/.Xauthority File new: no File locked: no Number of entries: 2 Changes honored: yes Changes made: no Current input: (argv):1 # ssh -X laptop 'xauth list' laptop/unix:10 MIT-MAGIC-COOKIE-1 84924c4306f8234702fe1cec2c821c8f >From the laptop: # xauth info Authority file: /var/run/gdm/auth-for-user-w9KmhU/database File new: no File locked: no Number of entries: 1 Changes honored: yes Changes made: no Current input: (argv):1 # xauth list laptop/unix:0 MIT-MAGIC-COOKIE-1 007d71f327f9cf279ff3c5fb9d21b5a7 At this point the ssh session from the desktop to the laptop has a cookie for display :10 only. So the message regarding a failure to open :0 isn't a big surprise. I resolved this by running the following from the desktop: # ssh -X laptop 'xauth merge /var/run/gdm/auth-for-user-w9KmhU/database' After this is run, you can check that the cookie has been added for :0 by running: # ssh -X laptop 'xauth list' laptop/unix:0 MIT-MAGIC-COOKIE-1 007d71f327f9cf279ff3c5fb9d21b5a7 laptop/unix:10 MIT-MAGIC-COOKIE-1 84924c4306f8234702fe1cec2c821c8f >From there I can run: # ssh -X laptop 'x2x -east -to :0.0' Here's the caveat, the cookie (and the file it's stored in) for :0 changes each time you log in on the remote machine (in this case, 'laptop'). Here's the output on the laptop after logging out and back into X. # xauth info Authority file: /var/run/gdm/auth-for-user-u4JpYD/database File new: no File locked: no Number of entries: 1 Changes honored: yes Changes made: no Current input: (argv):1 # xauth list laptop/unix:0 MIT-MAGIC-COOKIE-1 149afc922a496cae086650e10f113bf5 At this point, the command 'ssh -X laptop x2x -east -to :0.0' will again fail. I cleaned up by running 'ssh -X laptop xauth remove laptop/unix:0' so that I only had a cookie entry for :10 at this point. I don't have a real solution, but I hope this helps improve the understanding of the problem. -- x2x sharing problem i karmic https://bugs.launchpad.net/bugs/471726 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs -- universe-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/universe-bugs
