Re: Fail to connect from OSX to remote X-desktop?

I'm trying to connect via OSX's X11/Xephyr to a remote Linux server's
graphical desktop.

Following & trying to adapt a howto @,

  http://etbe.coker.com.au/2007/01/07/xephyr/

I'm failing.

The details of what I have are,

@ desktop, a Mac Powerbook running OSX 10.5.4,

uname -a
 Darwin powerbook 9.4.0 Darwin Kernel Version 9.4.0: Mon Jun  9
19:36:17 PDT 2008; root:xnu-1228.5.20~1/RELEASE_PPC Power Macintosh

echo $DISPLAY
 :0.0

cat ssh_config
 ...
 SendEnv DISPLAY
 ...

I've also updated to latest X11.app v2.3.0 @
http://xquartz.macosforge.org/trac/wiki/X112.3.0,

 "X11 2.3.0
  Released: 2008.07.19
  This release contains Xquartz-1.4.2-apple5."

man Xquartz | grep Version
X Version 11               xorg-server 1.4.2-apple5                 XQUARTZ(1)

I can readily SSH to the Xen DomU/remote,

ssh -F /usr/local/etc/ssh/ssh_config -l root kde_domu.mydomain.com

uname -a
 Linux kde_domu 2.6.25.11-0.1-xen #1 SMP 2008-07-13 20:48:28 +0200
x86_64 x86_64 x86_64 GNU/Linux

echo $DISPLAY
 :0.0

cat sshd_config
 ...
 AcceptEnv DISPLAY
 ...

cat /etc/sysconfig/displaymanager
DISPLAYMANAGER="yes"
DISPLAYMANAGER_REMOTE_ACCESS="yes"
DISPLAYMANAGER_ROOT_LOGIN_REMOTE="yes"
DISPLAYMANAGER_STARTS_XSERVER="yes"
DISPLAYMANAGER_XSERVER_TCP_PORT_6000_OPEN="yes"
DISPLAYMANAGER_AUTOLOGIN=""
DISPLAYMANAGER_PASSWORD_LESS_LOGIN="no"
DISPLAYMANAGER_AD_INTEGRATION="no"
DISPLAYMANAGER_SHUTDOWN="auto"
DISPLAYMANAGER_RANDR_MODE_VGA="auto"
DISPLAYMANAGER_RANDR_MODE_auto="1024x768_60 64.11 1024 1080 1184
1344 768 769 772 795 -HSync +Vsync"
DISPLAYMANAGER_XSERVER="Xorg"
DISPLAYMANAGER_XGL_OPTS="-accel glx:pbuffer -accel xv:pbuffer"
KDM_USERS=""
KDM_GREETSTRING=""
DISPLAYMANAGER_KDM_THEME="SUSE"
DISPLAYMANAGER_KDM_LOCALARGS=""

Also, of note, I can successfully use VNC from my desktop to get to
the DomU's graphical desktop.

but, trying with Xephyr,

@ the Mac/desktop, from the X11.app's xterm,

vi xephyr_start.sh
#!/bin/bash
set -x
defaults write com.apple.x11 nolisten_tcp -boolean false
CONF="/usr/local/etc/ssh/ssh_config"
MACH="kde_domu.mydomain.com"
USER="root"

COOKIE=`dd if=/dev/urandom bs=16 count=1 2>/dev/null | hexdump -e \\"%08x\\"`
FILE=~/.Xauth-Xephyr
rm -f $FILE

ssh -F $CONF -l $USER $MACH "echo \"add 192.168.1.6:2 . $COOKIE\" | xauth"
echo "add :2 . $COOKIE" | xauth -f $FILE
Xephyr :2 -auth $FILE -reset -terminate -screen 1280x1024 $* &
DISPLAY=192.168.1.6:2 ssh -F $CFG -l $USER $MACH twm
wait

then,

     sh xephyr_start.sh

fails & reports,

+ defaults write com.apple.x11 nolisten_tcp -boolean false
+ CONF=/usr/local/etc/ssh/ssh_config
+ MACH=kde_domu.mydomain.com
+ USER=root
+ XAUTH=/usr/X11R6/bin/xauth
+ XEPHYR=/usr/X11R6/bin/Xephyr
++ dd if=/dev/urandom bs=16 count=1
++ hexdump -e '"%08x"'
+ COOKIE=a9df93a5fbeb8d0cb37b00b3adf5f4dc
+ FILE=/var/root/.Xauth-Xephyr
+ rm -f /var/root/.Xauth-Xephyr
+ ssh -F /usr/local/etc/ssh/ssh_config -l root kde_domu.mydomain.com
'echo "add 192.168.1.6:2 . a9df93a5fbeb8d0cb37b00b3adf5f4dc" | xauth'
+ echo 'add :2 . a9df93a5fbeb8d0cb37b00b3adf5f4dc'
+ /usr/X11R6/bin/xauth -f /var/root/.Xauth-Xephyr
/usr/X11R6/bin/xauth:  creating new authority file /var/root/.Xauth-Xephyr
+ DISPLAY=192.168.1.6:2
+ ssh -F /usr/local/etc/ssh/ssh_config -l root kde_domu.mydomain.com twm
+ /usr/X11R6/bin/Xephyr :2 -auth /var/root/.Xauth-Xephyr -reset
-terminate -screen 1280x1024


Xephyr cannot open host display. Is DISPLAY set?
twm:  unable to open display ":0.0"
+ wait

Any ideas as to what to fix?

Thanks,

Wil
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