Problem with X server

[truc nguyen]

Hi

Why do you use a military account for this list?

--- "Wiedemann, Shane  CIV NAVAIR"
<shane.wiedemann at navy.mil> wrote:

> 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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> 
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> 
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