Re: Remote connections to X apps

[Casey Boone <caseyboone@gmail.com>]

is X running on the windows machine? and did you launch the ssh session 
from within X?


have you tried with a linux machine to rule out it being related to cygwin?

Casey


dsavage@peaknet.net wrote:
> Preface: Steve has been helping me establish remote connectivity to my
> home system(s). Unlike most users, I have a static external IP address.
> The Linksys WRT54G router at the house forwards specified TCP/UDP
> ports/services to internal machines using their internal (192.168.x.x)
> addresses.
>
> My objective is to establish the capability to run X applications on my
> home system(s) and have them display on any remote Linux, UNIX, or Windows
> system I choose. Thus far things have progressed to the point where I am
> able to reliably connect to my main home server (lion) from my Windows PC
> at work using secure shell from a Cygwin bash prompt. While CLI ssh and
> scp are good and useful, the ability to run graphical applications on my
> home server with their X displays remoted to my location would be a major
> step up.
>
> I realize that using a Windows PC and Cygwin rather than a Linux laptop
> adds additional complexity, but if I can get things working on a
> Windows/Cygwin box then a Linux box would be a no brainer.
>
> But enough preliminaries. The next step is to get a simple X application
> on the remote host to display on my local PC. I'm logged onto the home
> server with the following connection:
>
>    $ ssh -X -Y -l <user> <ip_address>
>    <user>@<ip_address>'s password: **************
>    Last login: Wed Jul 18 12:12:12 2007 from <remote>
>
>    Red Hat Enterprise Linux Server release 5 (Tikanga)
>    Wed Jul 18  12:41:49 CDT
>    [<user>@lion] ~
>    $
>
> Note that ssh's -X and -Y command line options allow X11 forwarding (see
> 'man ssh'). I've started Cygwin's X server on the PC here at work and
> leave it running in background ready to display any X session sent to it.
>
> A simple X application to try would be gedit:
>
>    $ gedit testfile.txt
>    cannot open display:
>    Run 'gedit --help' to see a full list of available command line options.
>
> Steve suggested I try running 'mkxauth' to create an .Xauthority file. "On
> which machine?", I hear you ask. Well, since there's no 'mkxauth' in
> Cygwin, that leaves only the remote server (where gedit will actually
> run). After reviewing the 'mkxauth --help' options, I type:
>
>    $ mkxauth -c <remote>
>    creating file /home/<user>/.Xauthority ... done
>    adding key for <remote> to /home/<user>/.Xauthority ... done
>
> OK... let's try gedit again:
>
>    $ gedit testfile.txt
>    cannot open display:
>    Run 'gedit --help' to see a full list of available command line options.
>
> Sigh. I try setting the display explicitly in the command line:
>
>    $ gedit testfile.txt --display=<remote>
>    cannot open display: <remote>
>    Run 'gedit --help' blah blah blah
>
> What other setup/configuration requirements have I missed? For those who
> might ask "Have you enabled X11 forwarding in the server's sshd_config
> file?", the answer is yes. I have noted that /etc/services contains two
> lines which refer to x11:
>
>    x11             6000/tcp        X      # the X Window System
>    x11-ssh-offset  6010/tcp               # SSH X11 forwarding offset
>
> I thought about adding them to the Linksys's router's forwarding table,
> but because the entire session is running in an ssh (22/tcp) tunnel, I
> think both of these are "don't cares".
>
> Ideas or suggestions, anyone?
>
> --Doc
>
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