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Re: How to run _X_ Session from RH8 via ssh -X? How to run vnc via ssh?
- From: René Berber <r dot berber at computer dot org>
- To: cygwin at cygwin dot com
- Cc: cygwin-xfree at cygwin dot com
- Date: Fri, 17 Mar 2006 13:03:50 -0600
- Subject: Re: How to run _X_ Session from RH8 via ssh -X? How to run vnc via ssh?
- Openpgp: url=ldap://keyserver.pgp.com
- References: <NUTMEGfcjcMzfoV1qdi00000029@NUTMEG.CAM.ARTIMI.COM> <00a701c649da$f91ad020$a501a8c0@CAM.ARTIMI.COM>
Siegfried Heintze wrote:
> > (2) For reasons I don't understand, there was a conflict between my router's
> > sshd and my cygwin's sshd so I resolved the problem by changing the cygwin'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 simultaneous
> > sessions on my win2003 server.
> > However, I cannot seem to start an X session from my "ssh -X -p 892
> > Administrator@18.104.22.168" 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 export
> > DISPLAY=<client lan address>:0.0 but that did not help: it still could not
> > open the display.
If you are using ssh -X or -Y you don't need to set DISPLAY, in fact ssh already
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 let 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.
> > 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 than one
user connecting to the same machine.
> > Is there also a cygwin VNC? I don't remember seeing one.
> > 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 firstname.lastname@example.org
server machine# ssh -gN -L 15901:localhost:5901 user@localhost
The numbers may have to be changed (as I said above) depending on what starting
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".
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