GTK warning :can't open display

[savita2912]

Hi All,

I have below problem and I tried many options but still it doesn't work.

1) I am looging(putty) into Linux(Redhat) box with root user.
2) I am setting a display of the same machine to itself ith below comand
export DISPLAY=localhost:1
3) try to run firefox
And it is giving me below error:

Xlib: connection to "10.58.190.140:2.0" refused by server
Xlib: No protocol specified


(firefox-bin:11451): Gtk-WARNING **: cannot open display:

I checked /etc/ssh/sshd_config file and it has

AllowTcpForwarding yes
#GatewayPorts no
X11Forwarding yes
#X11DisplayOffset 10
X11UseLocalhost yes
PrintMotd yes
PrintLastLog yes
TCPKeepAlive yes

Please help me out in this regard as i am not able o find any way out and it's taking long time.........

Regards,
savita

[daedae]

You shouldn't have to manually set DISPLAY if putty is configured for X11 forwarding. I believe the setting is under "Connection", "SSH", "X11". Make sure the box is checked next to "Enable X11 forwarding". Once this is done, and you connect to your Linux host, DISPLAY should already be set ( test with "echo $DISPLAY" ).

What X server are you running in Windows? xWin32? Cygwin?

[savita2912]

HI,

I am really new to Linux so wht u said like

"Make sure the box is checked next to "Enable X11 forwarding"

I didn't understand how to do it?

echo $DISPLAY gives:

10.58.190.140:1

[daedae]

No problem. I assume you are running putty from Windows. In the attached screen shot you will see the section that has "Enable X11 forwarding".

Having putty ( or any ssh client ) configured for X11 forwarding is only part of the equation. You will need an X11 server running on your Windows machine to render the graphical display ( Firefox in your example ).

X11 is a client/server protocol. Your X11 client ( Firefox ) needs to be displayed on an X11 server ( software running on your Windows box ). The same thing happens when you start graphical programs on any desktop that uses X11, only the clients and server are the same box.

Confused? Don't be. It just takes a little getting used to.

[savita2912]

Thanks.However I don't want to setup a display of windows machine to Linux but I want cronjob to run to setup DISplay of same machine to itself.

I have started VNCSERVER and use same session of vncserver to export display to the same machine.

[Lakshmipathi]

Just my thoughts:
When you invoke GUI binary say "mygui". From crontab Try and start xterm first then run the command. Something like

xterm -e "/path/to/mygui"

EDIT: First I would suggest you to run standard GUI application like firefox then try your own UI.

xterm -e "firefox"

[savita2912]

After foollowing I am getting below error :

Xlib: connection to "10.58.190.140:1.0" refused by server
Xlib: No protocol specified

Please help

[savita2912]

Evenif I tried

$xterm

It gives below error:
Xlib: connection to "10.58.190.140:1.0" refused by server
Xlib: No protocol specified

xhost: unable to open display "10.58.190.140:1"

[Lakshmipathi]

Check this thread http://www.linuxforums.org/forum/deb...specified.html

May be login as Non-root user and run your command.

[savita2912]

NOPE THIS ALSO DOESN'T WORK.

I tried with both root as well as other user bt same problem