X and ssh

ocularbob · 01-16-2003, 11:21 PM

when i try to launch and X-11 app from the command line over ssh i get this erro.

Gtk-WARNING **: cannot open display:

or

konqueror: cannot connect to X server

I wonder if anyone might know the root of this problem. I've been looking around for some sort of xserver config file.
thanks for any help.

trickykid · 01-17-2003, 12:35 AM

And I assume you have X11 forwarding thru ssh ? Or are you trying to launch an app thru ssh from just the command line ?

ocularbob · 01-17-2003, 12:41 AM

i am just launching from camand line but X11 forwarding is enabled on both ends. I tried to run konqueror from command line after logging in with
"ssh -X" and got back:
Xlib: connection to "localhost:10.0" refused by server
Xlib: Invalid MIT-MAGIC-COOKIE-1 key
konqueror: cannot connect to X server localhost:10.0

trickykid · 01-17-2003, 12:48 AM

I'm not totally familiar with X11 forwarding thru ssh but from my understanding when you connect with ssh -X and your connected, don't you have to startx first to run any applications ? Is the actual X server or X running when your trying to launch a program ?

ocularbob · 01-17-2003, 01:13 AM

well i hadn't really ever started a full x session from ssh or even tried before you're last post. when i did i got

# startx

Fatal server error:
Server is already active for display 0
If this server is no longer running, remove /tmp/.X0-lock
and start again.

When reporting a problem related to a server crash, please send
the full server output, not just the last messages.
Please report problems to feedback@suse.de.

Xlib: connection to ":0.0" refused by server
Xlib: Invalid MIT-MAGIC-COOKIE-1 key
giving up.
/usr/X11R6/bin/xinit4: unable to connect to X server
/usr/X11R6/bin/xinit4: No such process (errno 3): Server error.

I had a couple redhat boxes a while back and I could do a plain ol' ssh connection and just #konqueror (or anything else)

I'm starting to think that the problem is with X

trickykid · 01-17-2003, 01:33 AM

That means you already have an X server running.

Try this and see if it works:

startx -- :1

ocularbob · 01-17-2003, 01:38 AM

same result..
do i need to setup another "screen" in XF86Config?
not that i would know exactly how to do that....

moses · 01-17-2003, 07:33 AM

You should have these options set on the sshd server
(/etc/ssh/sshd_config):

Code:

X11Forwarding yes
X11DisplayOffset 10
X11UseLocalhost yes

On the ssh client (/etc/ssh/ssh_config):

Code:

   ForwardAgent yes
   ForwardX11 yes

The error you are seeing is because an X server on your ssh
server is running, and ssh isn't setting the DISPLAY variable
correctly in order to display to your ssh client. This is probably
because you are either not running X on your ssh client, or you
don't have all the options set as above.

You need to be running X on the ssh client in order for tunneling
to work. If you'd like to run a window manager from the ssh
server, see a related post:
http://www.linuxquestions.org/questi...threadid=41505

man ssh
man sshd

ocularbob · 01-17-2003, 11:49 AM

hmm..
both configs are setup properly and were from the get go.
both machines are already running X to their own display.
the problem seems to be that it won't let there be two X sessions at once.
All i want to do is run an X app on the host machine from the client.

moses · 01-17-2003, 12:32 PM

ssh into your server (the one running sshd), and type the
following, then post the output:

Code:

printenv DISPLAY

It should be something like:
servername:11.0
where servername is the machine running sshd.
It should not be:
servername:0.0
Setting this yourself will defeat the security of ssh (for X only),
but you could do so.

Also, does the user have a ~/.ssh/config file? If so, are the config
options mentioned above for ssh_config negated?

ocularbob · 01-17-2003, 01:15 PM

ok i got it to go! nice man nice.

so the root of all of my problems seems to always be related to some
VARIABLE in capital letters. what is the standard way to check and edit these. thanks alot

moses · 01-17-2003, 01:50 PM

It depends on your shell.
for all shells:

Code:

printenv

or

Code:

env

will display your environment.
For bourne shells (bash, sh, ksh, etc.)

Code:

export ENVVAR=value

will export ENVVAR with the value "value" to your environment.
For C-shells (csh, tcsh, etc.)

Code:

setenv ENVVAR value

will do it.

ocularbob · 01-18-2003, 07:36 AM

hey cool,
thanks alot for you're help.
I'm starting a new thread
"X11 config files?"