Public bug reported:
If you disable IPv6 in /etc/sysctl.conf sshd will not forward X11.
It logs the failue in /var/log/auth.log
Oct 27 18:49:26 uscps002 sshd[14722]: Accepted password for root from
172.20.10.50 port 60322 ssh2
Oct 27 18:49:26 uscps002 sshd[14722]: pam_unix(sshd:session): session opened
for user root by (uid=0)
Oct 27 18:49:27 uscps002 sshd[14722]: error: Failed to allocate internet-domain
X11 display socket.
Aparently the compiled sshd version will not try an ipv4 localhost if an
ipv6 localhost does not exist.
Placing the following line in /etc/ssh/sshd_config fixes the issue
X11UseLocalHost no
root@uscps002:/var/log# lsb_release -rd
Description: Ubuntu 11.10
Release: 11.10
root@uscps002:/var/log#
root@uscps002:/var/log# uname -a
Linux uscps002 3.0.0-12-server #20-Ubuntu SMP Fri Oct 7 16:36:30 UTC 2011
x86_64 x86_64 x86_64 GNU/Linux
** Affects: openssh (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/882878
Title:
With IPv6 disable openssh will on forward X connections
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