[Bug 434799] Re: X11 forwarding via SSH does not work after upgrade to karmic

[Rush Tonop Online]

My case:

# Go to workstation
rush at laptop:~$ ssh -X workstation

# Check for $DISPLAY
rush at workstation:~$ env | grep DISPLAY || echo "No display found"
No display found

# Check log
workstation:~$ sudo -s
workstation:~# grep X11 /var/log/auth.log
Sep 23 16:33:10 workstation sshd[14105]: error: Failed to allocate internet-domain X11 display socket.

# Yes, it is!

# Check ipv6 suppport
root at workstation:~# sysctl net.ipv6.conf.all.disable_ipv6 
net.ipv6.conf.all.disable_ipv6 = 1

# It's the answer.
# Now we must disable ipv6 support in sshd too:
root at workstation:~# sed -i 's|^exec /usr/sbin/sshd$|exec /usr/sbin/sshd -4|g' /etc/init/ssh.conf 
root at workstation:~# service ssh restart
root at workstation:~# exit
rush at workstation:~$ exit

# Check changes
rush at laptop:~$ ssh -X workstation

# Check for $DISPLAY
rush at workstation:~$ env | grep DISPLAY || echo "No display found"
DISPLAY=localhost:10.0

Done.

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X11 forwarding via SSH does not work after upgrade to karmic
https://bugs.launchpad.net/bugs/434799
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