Can't open display -- SOLVED

[Paul Howarth]

On Fri, 2005-07-01 at 14:10 -0500, Wojciech Komornicki wrote:
> I was getting the message
>         Can't open display: xxx.xxx.xxx.xxx:0.0
> It terns out that by default on my FC4, X does not listen to tcp.  You
> can enable listening to the TCP port by running 
>         gdmsetup
> as root or be editing the file
>         gdm.conf
> The relevant setting is
>         DisallowTCP
> If you want X to listen the tcp set this to false
> 
> You will have to restart the X server after making changes. To run a
> program (prog) on the client (light.unix) which will have its display on
> the server (dark.unix) you need to
>       1) tell the server that you allow light.unix to talk to it with
>             xhost +light.unix
>       2) start prog (on light.unix) with the command
>             prog -display dark.unix:0.0
>          (or you can set the DISPLAY environment variable)
> 
> I have not been able to get authentication working using xauth which
> should allow you to run programs without using xhost.

Why don't you use "ssh -X light.unix" on dark.unix, opening a secure
connection from dark to light with X forwarding (i.e. running "prog"
just works), so that you don't need to set up the tcp listening and
don't have to mess about with "xhost" and $DISPLAY?

Paul.
-- 
Paul Howarth <paul at city-fan.org>