RE: x over putty x forwarding over ssh and the like.

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Author: todd hewett
Date:  
To: plug-discuss
Subject: RE: x over putty x forwarding over ssh and the like.
A portion of my [root@ns1 root]# vi /etc/ssh/sshd_config is bellow:

# Set this to 'yes' to enable PAM keyboard-interactive authentication
# Warning: enabling this may bypass the setting of 'PasswordAuthentication'
#PAMAuthenticationViaKbdInt no

X11Forwarding yes
#X11DisplayOffset 10
#X11UseLocalhost yes
#PrintMotd yes
#PrintLastLog yes
#KeepAlive yes
#UseLogin no
#UsePrivilegeSeparation yes
#PermitUserEnvironment no
#Compression yes

#MaxStartups 10
# no default banner path
#Banner /some/path
#VerifyReverseMapping no


I have removed the # from X11Forwarding and changed it to yes.
Does the server read this file every time SSH is used or does SSH need to
restarted for this to take effect?

I have downloaded Cygwin with x.org. I open a Cygwin bash shellon local
machine and type xwin -multiwindow &" and I get
the X logo in the task tray.

In that same Cygwin bash shell I type echo $DISPLAY

And I get Todd G. Hewett@RoadHArd4 ~

Putty has x11 forwarding enabled but display is set to localhost:0

Thanks for your help.

Todd




-----Original Message-----
From:
[mailto:plug-discuss-admin@lists.plug.phoenix.az.us] On Behalf Of Jonathan
Hohle
Sent: Monday, January 24, 2005 12:39 PM
To:
Subject: Re: x over putty x forwarding over ssh and the like.

It can't open the display on your local windows machine (which needs
an x server). The easist way I've found is to install X.org through
cygwin. start the xserver using "xwin -multiwindow &" and you'll get
the X logo in the task tray. when you connect via putty, make sure
that you check "Enable X11 forwarding" in Connection>SSH>Tunnels. you
can check to see if the display was connected properly by running echo
$DISPLAY to see if the display variable has been set.

I've got this working on several different distributions and has
always worked well. let me know if i left anything out.

Jon
<><


On Mon, 24 Jan 2005 10:52:55 -0700, todd hewett
<> wrote:
> So I am still trying to get X over SSH working.
>
> When I run command:
> [root@ns1 root]# xeyes
> Error: Can't open display:
>
> I wonder if this is because where I have the X display location set up in
> putty. Localhost:0
>
> If I run xinit over my SSH connection to server I get:
>
> (==) Log file: "/var/log/XFree86.0.log", Time: Mon Jan 24 10:50:42 2005
> (==) Using config file: "/etc/X11/XF86Config-4"
> (EE) xf86OpenSerial: Cannot open device /dev/psaux
>         No such device.
> (EE) Mouse0: cannot open input device
> (EE) PreInit failed for input device "Mouse0"
> No core pointer

>
> Fatal server error:
> failed to initialize core devices
>
> If you encounter a server crash, please report the problem by filing a bug
> report in the XFree86.org bugzilla at http://bugs.xfree86.org and/or Red

Hat
> bugzilla at http://bugzilla.redhat.com/bugzilla.  When filing your report,
> it
> is very important that you explain your problem in as much detail as
> possible,
> and include a complete description on how to reproduce the problem.  After
> submitting the bug report, attach the following files as uncompressed
> individual file attachments using the bugzilla file attachment feature:
>         - X server log file: /var/log/XFree86.0.log
>         - Kernel log file: /var/log/messages

>
> XIO:  fatal IO error 104 (Connection reset by peer) on X server ":0.0"
>       after 0 requests (0 known processed) with 0 events remaining.

>
> Thanks for your insite
>
> -----Original Message-----
> From:
> [mailto:plug-discuss-admin@lists.plug.phoenix.az.us] On Behalf Of Kevin
> Brown
> Sent: Sunday, October 31, 2004 2:12 AM
> To:
> Subject: Re: x over putty x forwarding over ssh and the like.
>
> >> Anyone have any experience running x over SSH?
> >>
> >> I have made it this far:
> >>
> >>
> >> - Make sure the X server is configured and running - Open your SSH
> >> session (with X11 forwarding enabled) - type xterm, or your window
> manager
> >> command, or the name of any other X program
> >>
> >> Here is the rub that I have.
> >>
> >> My Linux box is sitting in a rack without a mouse or keyboard attached

to
>
> >> it.
> >>
> >> So when I startx it fails because it is looking for local mouse and
> >> keyboard that are not attached to it.
> >>
> >>
> >> Is there a good (easy) way around this?
>
> > I use vncserver. I ssh into my linux machine from windows via putty.

Start
>
> > the server with `vncserver :1 -geometry 1024x768`. I can then tunnel my
> vnc
> > session(?) through putty.
> >
> > I haven't tried doing this from one linux machine to another.
>
> I have experience doing X over SSH and never bothered with doing startx.

I
> just
> fired off whatever app I needed or even just fired up my WM directly (e.g.
> icewm
> &). You should only be doing startx when you are logged directly into the
> machine at the local keyboard/mouse...
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--
Jon
<><
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