Re: X forwarding and X11UseLocalhost

I had the same problem on Gentoo a week or two ago, suddenly 'ssh -X' stopped 
working. The remote display was pointing to the remote machines real display, 
not to the forwarded one. The problem was caused by a change in the 
pam-package.

Am Mittwoch, 24. November 2004 21:56 schrieb Michael J. Barillier:
> I've been using X11 forwarding, but since switching from XFree86 to
> X.org (on both local and remote hosts, both running Gentoo Linux,
> 2.6.9 kernel and OpenSSH v3.8.1p1) I've observed that `ssh -X
> userid@remotehost' results in DISPLAY being set in the remote shell to
> `thishost:0.0' (where thishost is the system system from which I'm
> connecting) rather than `localhost:10.0' as it had before.  The server
> does have X11UseLocalhost set to `yes' in sshd_config, so I'm a little
> stumped.  I'd like to get the old behavior working, rather than use
> `xhost +remotehost' on thishost.

> Where can I start looking for the cause of this change (short of the
> source code itself - I'm hoping it won't come to that and someone will
> know the fix off-hand)?

Check if you activated UsePamEnv in your sshd_config. If activated, 
edit /etc/security/pam_env.conf and comment the following two lines out:

REMOTEHOST     DEFAULT= OVERRIDE=@{PAM_RHOST} 
DISPLAY                DEFAULT=${REMOTEHOST}:0.0 OVERRIDE=${DISPLAY}

Original posting on forums.gentoo.org:
http://forums.gentoo.org/viewtopic.php?p=1823616


-- 
  Mok wat du wullt, de Lüd snackt doch.

  Lars Rehe
  Alfred Wegener Institut für Polar- und Meeresforschung