[svlug] couldn't connect to display ":0.0"

[J C Lawrence]

On Mon, 6 Sep 2004 19:39:03 -0700 
David E Fox <dfox at m206-157.dsl.tsoft.com> wrote:
> On Wed, 01 Sep 2004 23:25:36 -0600 "skip evans"
> <skipevans2004 at hotmail.com> wrote:

> The other thing is I don't like xhost. 

It is inherently insecure.

> I used to have all sorts of problems with it not working properly on
> RH a few years ago. 

!?  

> Do you have difficulties running this script (I suspect it needs some
> X resources) as root from an xterm that you've su'ed prior to root?

Getting Xauthority properly setup is not difficult.  The general picture
of what's going on is:

  1) Some program generates a magic cookie (arbitrary string) and writes
  this to a file.

  2) The name of this file (often ~/.Xauthority) is passed to the X
  server.

  3) The X server writes an entry for the DISPLAY into your
  ~/.Xauthority file.

  4) Xlib reads ~/.Xauthority when you create a window, and passes the
  cookie value back to the X server.

See your X11 init and control scripts (usually down under /etc/X11) for
details.  This is no hard stuff.  To (re)synchronise the session key
across hosts:

  xauth nlist $DISPLAY | rsh other.host xauth nmerge -

Or just use SSH's X11 forwarding.

-- 
J C Lawrence
---------(*)                Satan, oscillate my metallic sonatas.
claw at kanga.nu               He lived as a devil, eh?
http://www.kanga.nu/~claw/  Evil is a name of a foeman, as I live.