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Re: X Display from remote host and ssl/ssh



On  0, Sebastian Canagaratna <s-canagaratna@onu.edu> wrote:
> Hi:
>  
>   I am using Debian unstable (or is it testing, now that woody has
>   become the stable deistribution?) and Linus 2.4.8. I used to connect
>   to remote machines (first xhost + remotehost) by telnet
>   then on the remote host type DISPLAY=myhost:); export DISPLAY
>   and then xterm & and the xterm would appear on my display.
> 
>   One of the remote hosts now uses ssh, so I have to use ssh. I can
>   connect to it without any problem, but when I type xterm & and
>   connection fails. The ssh man pages says I shouldn't define DISPLAY.
>   But whether I do or don't the result is the same.

How about 'ssh X remotehost.remotedomain'?  That will forward X calls
over the secure tunnel, if the remote ssh server is configured to
allow this.

>   For the other machine I use telnet-ssl, and there too, after defining
>   DISPLAY, I fail to connect.

You should not set DISPLAY when using ssh.  There are two things that
you should check:

1. That the remote server supports X forwarding.
2. That your X server is listening for TCP connections.

The first will be in /etc/ssh/sshd_config (if the remote host is a
Debian machine) and the option is X11Forwarding.  The second is
configured in one of /usr/X11R6/lib/X11/xdm/Xservers (if you use XDM)
or /usr/X11R6/lib/X11/xinit/xserverrc (if you don't).

I think by default Debian machines do not allow X forwarding and do
not listen for TCP connections to X servers.

Tom
-- 
Tom Cook
Information Technology Services, The University of Adelaide

Classifications of inanimate objects:  Those that don't work, those that break down, and those that get lost.

Get my GPG public key: https://pinky.its.adelaide.edu.au/~tkcook/tom.cook-at-adelaide.edu.au

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