[FreeNX-kNX] Unable to open Display

[Florian Schmidt]

Hi,

NX set's locally the Display to 1000 plus the session number (the first one
is 0) so the display on your NX server is unix:1000 -> the unix is used for
local socket operations only.

When you connect to an different machine you need a possibility to connect
and forwarding you X11 credentials automatically. Telnet doesn't support X11
forwarding (at least out of the box).

So I would suggest that you use ssh -X <hostname> instead to use X11
forwarding.

If there is any real reason (I can't see any in any case) that you are
forced to use telnet (I am wondering that this is still alive :) ) you can
set your display than on the machine by setenv DISPLAY
<loginserverhostname>:1000 (tcsh) or export
DISPLAY=<loginserverhostname>:1000 (bash) and than do an xhost
+<hostnamewhereItelnetedto> on your NX LoginServer.

Cheers,
Florian


2009/6/9, Holger Krull <holger.krull at gmx.de>:
>
> Daniel Spannbauer schrieb:
>
> >
> > Holger Krull schrieb:
> >> Daniel Spannbauer schrieb:
> >>> Hello,
> >>>
> >>> I'M using FreeNX 0.5.0 and NX-1.5.0 under SuSE 10.2.
> >>> The Login with the actal NXClient from Nomachine works perfectly. But
> in
> >>> NX when I do a telnet to an other host and try to start a X-application
> >>> I get "unable to open Display". Display is set to unix:1000.
> >>> If I do a xhost + an try to start the app again there is also the error
> >>> "cannot connect to X server unix:1000.0".
> >> Check if there really is a X-Server listening on Port 1000.
> >> Why don't you set DISPLAY on the remote host to ip.address.of.nx:1000 ?
> >> How is unix:1000 supposed to work?
> >
> > unix:1000 is set automaticly by NX (oder FreeNX). Its the default, not
> > my idea.
> > How can I check if a Xserver is listening on that port? If I logged in
> > with NX aon KDE a "echo $DISPLAY" sais "unix:1000".
>
>
> Do a
>   netstat -tlnp |grep nx
>
> if that outputs something like
> tcp        0      0 0.0.0.0:8000            0.0.0.0:*
> LISTEN      6735/nxagent
>
> you have the Xserver listening.
>
> unix:1000.0 as DISPLAY will not work on the computer you logged in via
> telnet. It is purely local to the computer your nxagent is running on.
>
>
> I recommend you use ssh with -X or -Y as parameter to connect from your nx
> session to the third computer instead of telnet. That will tunnel the X
> connection and set DISPLAY accordingly.
>
>
> ________________________________________________________________
>      Were you helped on this list with your FreeNX problem?
>     Then please write up the solution in the FreeNX Wiki/FAQ:
>
> http://openfacts2.berlios.de/wikien/index.php/BerliosProject:FreeNX_-_FAQ
>
>          Don't forget to check the NX Knowledge Base:
>                  http://www.nomachine.com/kb/
>
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