Problem with X server

Tue May 6 18:11:55 UTC 2008

See Nigel Wade's response below... 

-----Original Message-----
From: redhat-list-bounces at redhat.com
[mailto:redhat-list-bounces at redhat.com] On Behalf Of obed
Sent: Tuesday, May 06, 2008 10:35
To: General Red Hat Linux discussion list
Subject: Re: Problem with X server

How did it work?... what was the problem?

On Tue, May 6, 2008 at 12:18 PM, Wiedemann, Shane  CIV NAVAIR
<shane.wiedemann at navy.mil> wrote:
> Success!!  You solved my problem! Thank you for taking time to  
> respond...much appreciated.
>  Cheers,
>  Shane Wiedemann
>
>
>  -----Original Message-----
>  From: redhat-list-bounces at redhat.com
>
> [mailto:redhat-list-bounces at redhat.com] On Behalf Of Nigel Wade
>  Sent: Tuesday, May 06, 2008 9:09
>  To: General Red Hat Linux discussion list
>  Subject: Re: Problem with X server
>
>
>
> Wiedemann, Shane CIV NAVAIR wrote:
>  > So this problem is most likely user error; none the less...
>  > I have some software (only one other place has this software) that 
> to  > view video windows that the software tries to pop up, you need 
> to use  > the following command to get it to display:
>  > "software_name -display hostname", or at least that is what I am
told.
>  > I have inserted my hostname where it says "hostname" and verified 
> with
>
>  > "uname" that my hostname is correct.  I am not connecting to a 
> remote  > machine, am not on a network and am running the software on 
> a  > stand-alone machine.  The vendors of the software do connect 
> remotely,
>
>  > I believe, and they can pop video display windows just fine.  
> Whenever
>
>  > I run the software, I get a message that says "Unable to connect to

> x  > server".
>  > I currently have the DISPLAY variable set to ":0.0" and this seems 
> to  > be fine for opening programs, such as NEdit.  Any other setting 
> (even  > "hostname:0.0") and I cannot start programs such as editors 
> and other  > programs that open in a separate window.  I get errors 
> that say "can't
>
>  > open display" and the like.
>  >
>  > When I run the software, if I leave out the command "-display  
> hostname"
>  > all video rendering is done behind the scenes, i.e., I can't view
it.
>
>  > I have tried replacing "hostname" with all of the following:
>  > hostname:0.0
>  > :0.0
>  > hostname:0
>  > localhost
>  > localhost:0.0
>  > localhost:0
>  >
>  > Any clues?
>
>  I think you probably need to enable your X display to listen on the  
> network.
>
>  The software you are using is pretty strange. It should not be 
> necessary  to specify the -display option, it should use whatever 
> DISPLAY is set  to. However, given that it does what it does, you are 
> pretty much at its  mercy.
>
>  By default the X display does not listen for network (TCP) 
> connections,  it allows local connections using a UNIX domain socket. 
> If you have  DISPLAY set to :0 clients will connect on the UNIX 
> socket, but if you  specify a hostname (even localhost) then the 
> connection will be done on  a TCP socket. If the X server isn't 
> listening on a TCP socket then the  connection will fail. This is a 
> quite sensible security precaution (it  prevents any non-local clients

> connecting to your display, even if you  use the xhost + security 
> disabler) but can cause problems for any  software which expects to be
able to connect via a TCP socket.
>
>  To enable the TCP socket you need to modify the X server startup. How

> you do that depends on what version of RedHat you are using. For RH 4 
> it  is set in /etc/X11/gdm/gdm.conf. To enable TCP connections you 
> need to  change the line:
>    DisallowTCP=true
>  to
>    DisallowTCP=false
>
>  In KDE desktop you can also set this using the System Settings->Login

> Screen dialog (I presume there's something similar for Gnome). In the

> Security tab un-check the box marked "Always disallow TCP connections 
> to  X server".
>
>
>  --
>  Nigel Wade, System Administrator, Space Plasma Physics Group,
>              University of Leicester, Leicester, LE1 7RH, UK
>  E-mail :    nmw at ion.le.ac.uk
>  Phone :     +44 (0)116 2523548, Fax : +44 (0)116 2523555
>
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