[Bug 518962] Re: ssh client does not forward X11 to local user's networked DISPLAY

[David Leon]

More information: On Karmic, SSH doesn't seem to understand the ipv6
prefix of the display, unless the display number is 0.

server1: echo $DISPLAY
::ffff:10.50.50.129:4.0
server1:~$ xauth list
#ffff#3a3a666666663a31302e35302e35302e313239#:4  MIT-MAGIC-COOKIE-1  88d9f68e0648ff171df763364d5e9439

ssh -X root at server2
root at server2's password: 
Warning: No xauth data; using fake authentication data for X11 forwarding.
...
server2: gedit
connect /tmp/.X11-unix/X4: No such file or directory
cannot open display: 


If you change the address of the DISPLAY to a simple ipv4 or if the
display is ipv6address:0.0 you get the forwarded display but not the
xauth data:

server1:~$ export DISPLAY=10.50.50.129:4.0
SIDORVE\sirlkd at sirdevubu01:~$ xauth list
#ffff#3a3a666666663a31302e35302e35302e313239#:4  MIT-MAGIC-COOKIE-1  88d9f68e0648ff171df763364d5e9439
server1:~$  ssh -X root at server2
root at server2's password: 
Warning: No xauth data; using fake authentication data for X11 forwarding.
...
server2:~# gedit
Invalid MIT-MAGIC-COOKIE-1 keycannot open display: 

If you change both to ipv4 format it works:

server1:~$ export DISPLAY=10.50.50.129:4.0
server1:~$ xauth add 10.50.50.129:4.0  MIT-MAGIC-COOKIE-1  88d9f68e0648ff171df763364d5e9439
server1:~$ ssh -X root at server2
root at server2's password: 
...
server2:~# gedit
server2:~# 

I'll try to work around this by writing a xprofile script that does the
transformations.

-- 
ssh client does not forward X11 to local user's networked DISPLAY
https://bugs.launchpad.net/bugs/518962
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