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From: =?ISO-8859-1?Q?Ren=E9_Berber?= <r.berber@computer.org>
Subject:  Re: How to run _X_ Session from RH8 via ssh -X? How to run vnc via  ssh?
Date:  Fri, 17 Mar 2006 13:03:50 -0600
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Siegfried Heintze wrote:
[snip]
> > (2) For reasons I don't understand, there was a conflict between my rou=
ter's
> > sshd and my cygwin's sshd so I resolved the problem by changing the cyg=
win's
> > configuration file to start sshd on a different port. Now, using a Red =
Hat 8
> > client, I can use both rdesktop and ssh to create two different simulta=
neous
> > sessions on my win2003 server.
> >
> > However, I cannot seem to start an X session from my "ssh  -X -p 892
> > Administrator@209.22.31.134" session. I tried running "explorer ." and =
that
> > just hung. OK, that was not an X program.  Then I tried
> > /usr/X11R6/bin/xclock and it said it could not open the display. Having
> > already done a xhost+ <remote wan address> before running ssh I tried e=
xport
> > DISPLAY=3D<client lan address>:0.0 but that did not help: it still coul=
d not
> > open the display.

If you are using ssh -X or -Y you don't need to set DISPLAY, in fact ssh al=
ready
did set it.  But if you set DISPLAY then X uses the normal ports and those =
will
have to be opened/redirected on the firewall.

> > Do I need to punch a whole in my client's firewall? I doubt the will le=
t me
> > do that.

Not if you only use ssh.  But take in consideration that you changed ssh to=
 use
port 892, that one is the one that will have to be opened.

> > Don't I need to start the xserver?

In the remote system? no.

[snip]
> > winCheckDisplayNumber - Cygwin/X is already running on display 0

It was running already but it's not needed unless you want to use VNC.

> > (3) What about vnc? I have installed RealVNC on both the RH8 client and=
 the
> > Windows 2003 server.

For VNC you'll need to open port 5901 (or 5801 for http); this is only for =
the
first window, it really is 5900 + display number, in case you have more tha=
n one
user connecting to the same machine.

> > Is there also a cygwin VNC? I don't remember seeing one.

No.

> > Can I make vnc tunnel thru ssh? Would I use the -L or the -R qualifier
> > on ssh? What would that look like?

Yes.  You have to start the VNC server and then (assuming display 1 is used=
):

client machine# ssh -NfC -L 5901:server.name.or.ip:15901 user@server.name.o=
r.ip

server machine# ssh -gN -L 15901:localhost:5901 user@localhost

The numbers may have to be changed (as I said above) depending on what star=
ting
the server reported as display number or how is setup to start if you start=
 it
from the X server.

On the client you use as VNC server "localhost:1".

HTH
--=20
Ren=E9 Berber


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