RE: X11 Forwarding

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To: "'Christ, Bryan'" <bryan.christ@hp.com>
Date: Tue, 19 Apr 2005 11:55:03 -0500

Purely speaking, X and ssh are completely separate items. Ssh will work
without X and vice versa. Ssh will also work just fine without $DISPLAY set.

On my HP-UX and RH systems, I always needed to set my $DISPLAY. You should
be looking at your Xserver more than your ssh setup.

Regards, Marshall

-----Original Message-----
From: Christ, Bryan [mailto:bryan.christ@hp.com]
Sent: Tuesday, April 19, 2005 11:39 AM
To: McDougall, Marshall (FSH)
Cc: secureshell@securityfocus.com
Subject: RE: X11 Forwarding

Thanks for the reply Marshall.

As far as I can tell, at least according to what I have read, there
shouldn't be any need to set DISPLAY manually. It seems it should be
set automatically based on the setting/value for X11DisplayOffset (I
think sshd does the dirty work upon login). If this is not the case,
then I must have misunderstood.

-----Original Message-----
From: McDougall, Marshall (FSH) [mailto:MarMcDouga@gov.mb.ca]
Sent: Tuesday, April 19, 2005 10:24 AM
To: Christ, Bryan
Subject: RE: X11 Forwarding

You need to set it. Depending on your OS, you can readily script it to
automatically set it when you login. For example, in my RH servers I
put the following in /etc/bashrc:

#setup DISPLAY
XX=`who am i | sed -ne 's/.*(//;s/).*$/:0/p'` test "x$XX" != x &&
export DISPLAY="$XX"

Regards, Marshall

-----Original Message-----
From: Christ, Bryan [mailto:bryan.christ@hp.com]
Sent: Monday, April 18, 2005 9:46 AM
To: secureshell@securityfocus.com
Subject: X11 Forwarding

Does anyone know why my DISPLAY variable is not getting set? I have
tried looking at the debug messages from

ssh -vv -X user@host

but I haven't seen anything suspicious. xauth is installed in the normal
location and seems to run correctly (although I'm really not familiar
with it). In my sshd_config file, the relevant options are set as:

X11Forwarding yes
X11DisplayOffset 10
#X11UseLocalHost no
#UseLogin yes

I've spent quite a bit of time googling on this problem and haven't come
up with anything yet. I suspect that it might have something to do with
installing XFree86 on Slackware 9.0 after initial OS installation (using
installpkg *.tgz on the relevant packages). I'm really at a loss for
where to turn.

Server is OpenSSH 3.5p1, OpenSSL 0.9.7a
Client is OpenSSH 4.0p1, OpenSSL 0.9.7f

Thanks in advance!

• Previous message: Christ, Bryan: "RE: X11 Forwarding"
• Maybe in reply to: Christ, Bryan: "X11 Forwarding"
• Next in thread: Greg Wooledge: "Re: X11 Forwarding"
• Reply: Greg Wooledge: "Re: X11 Forwarding"
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