[SOLVED] Problem using X Windows Server from X Client

chaditya · 01-22-2013, 07:47 AM

Hi,

I have started the X Windows server on my PC (running Windows 7). I'm trying to run the X Client (TCP Mon GUI Program) from Linux server.

I'm following the below steps:
1) export DISPLAY=IPAddress:0.0
2) Logging in as "su"
3) Executing the script.

The problem is when I try to execute the above steps I'm getting the below error:

Xlib: connection to "xxx.xx.xx.xx:0.0" refused by server
Xlib: No protocol specified

java.lang.NoClassDefFoundError: Could not initialize class sun.awt.X11GraphicsEnvironment
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Class.java:169)
at java.awt.GraphicsEnvironment.getLocalGraphicsEnvironment(GraphicsEnvironment.java:68)
at sun.awt.X11.XToolkit.<clinit>(XToolkit.java:89)
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Class.java:169)
at java.awt.Toolkit$2.run(Toolkit.java:834)
at java.security.AccessController.doPrivileged(Native Method)
at java.awt.Toolkit.getDefaultToolkit(Toolkit.java:826)
at sun.swing.SwingUtilities2$AATextInfo.getAATextInfo(SwingUtilities2.java:126)
at javax.swing.plaf.metal.MetalLookAndFeel.initComponentDefaults(MetalLookAndFeel.java:1556)
at javax.swing.plaf.basic.BasicLookAndFeel.getDefaults(BasicLookAndFeel.java:130)
at javax.swing.plaf.metal.MetalLookAndFeel.getDefaults(MetalLookAndFeel.java:1591)
at javax.swing.UIManager.setLookAndFeel(UIManager.java:541)
at javax.swing.UIManager.setLookAndFeel(UIManager.java:581)
at org.apache.ws.commons.tcpmon.TCPMon.setupLookAndFeel(TCPMon.java:138)
at org.apache.ws.commons.tcpmon.TCPMon.main(TCPMon.java:159)

Please help.

Aditya

shivaa · 01-22-2013, 08:09 AM

On your linux server, before launching the X window, once invoke:-

Code:

xhost +<hostname/ip-windows-system>

Also while login, are you using X-forwarding or not? And what's in your script. Once invoke it in debug mode as:-

Code:

#!/bin/bash
set -xv
(Rest part of script)

chaditya · 01-22-2013, 08:20 AM

Quote:

Originally Posted by shivaa

On your linux server, before launching the X window, once invoke:-

Code:

xhost +<hostname/ip-windows-system>

Also while login, are you using X-forwarding or not? And what's in your script. Once invoke it in bedug mode as:-

Code:

#!/bin/bash
set -xv
(Rest part of script)

When I execute the xhost +hostname, I'm getting below error:

xhost: unable to open display ""

shivaa · 01-22-2013, 08:27 AM

You have to set display of remote machine (is that a Windows machine?) where you want to launch this X-window, not your local Linux server's display.

Connect to remote machine, and (if it's Unix based), invoke:

Code:

~$ echo $DISPLAY
(some_output)
~$ DISPLAY=(some_output); export DISPLAY

theNbomr · 01-22-2013, 06:51 PM

The most common scenario when running an X client is that the X server is on the workstation which has the user console. That means either the X server is on the same host as the X client, or that the user has logged into the X client host from a workstation that is running the X server. I will assume the latter since there are two OS's involved.
The easiest (also the best & most secure) way to accomplish your objective is to log into the X client linux host with an SSH client that can do X tunneling. When doing so, it will automatically set up the correct $DISPLAY variable on the X client host, and will silently route all X traffic to the X server on your local host. For Windows SSH clients, putty seems to be the weapon of choice for most people, as I understand it. SSH under Cygwin will also work, and there are a number of others.
If you were doing this from another Linux shell, the ssh command would look like

Code:

ssh -X you@your.xserver.host

The method of manually setting $DISPLAY on the X client host may not work at all unless the X server is configured to accept remote TCP connections. Using the X tunnel method, the X traffic is seen by the X server as local, since the local ssh client is what makes the X connection.

--- rod.