vnc .. black vnc client screen

Bruce Douglas bedouglas "at" earthlink.net
Sun Jan 5 03:20:01 2003


Hey!!!

To all who've seen/responded to my posts regarding the issue, I thank you.
It appears that the problem of a blank/black screen can be caused by having
too many applications running on the client machine.

I'm not sure as to what the magic number of applications is, nor am I sure
as to what might be the actual cause (ie, memory shortage, lack of sockets,
etc...) I simply know that under certain circumstances, if you have too many
applicatins running on your client machine, you will experience a
blank/black screen when connecting to the VNC Server using a VNC client.

I will try to write up what I've seen/experienced and get it to the VNC
team.

In the mean time, if you think you've got everything setup correctly, start
closing applications!!!

I've tried to do a quick search and have not come across anything that
indicates this to be a known problem.


Regards,

Bruce



-----Original Message-----
From: vnc-list-admin "at" realvnc.com [mailto:vnc-list-admin "at" realvnc.com]On
Behalf Of Bill Cassady
Sent: Saturday, January 04, 2003 4:56 PM
To: Bruce Douglas
Cc: vnc-list "at" realvnc.com
Subject: RE: vnc .. black vnc client screen


> Xlib:  extension "RENDER" missing on display ":2.0".
> Unable to open desktop file applications:///Internet/redhat-email.desktop
> for pa
> nel launcher: Error reading file
> 'applications:///Internet/redhat-email.desktop'
> : File not found
> Unable to open desktop file
> applications:///Office/redhat-word-processor.desktop
>  for panel launcher: Error reading file
> 'applications:///Office/redhat-word-proc
> essor.desktop': File not found
> Unable to open desktop file
> applications:///Office/redhat-presentations.desktop
> for panel launcher: Error reading file
> 'applications:///Office/redhat-presentati
> ons.desktop': File not found
> Unable to open desktop file
> applications:///Office/redhat-spreadsheet.desktop fo
> r panel launcher: Error reading file
> 'applications:///Office/redhat-spreadsheet.
> desktop': File not found
> Xlib:  extension "RENDER" missing on display ":2.0".


Bruce-

It looks to me that your install files are not where X expects to find
them.

I would suggest a couple of things:

1) Check your XF86Config file, (in my system in the /etc directory),
and see where it instructs you to put the fonts and the rgb files;
then make sure that the vncserver program puts them there.
After making any needed changes to vncserver file then rerun the
install program.

(modifying the xstartup file will not suffice)

2) To make things easy on yourself, before getting into the complexity
of gnome, specify a lean-and-mean window manager; if you don't like
twm I would recommend icewm: it's simple, fast, beautiful and
functional. (That step IS in the xstartup file, no?)

I believe that if you reduce the complexity of your configuration and
check each element step-by-step you may have better success.

And -- Oh, yes...check the .X.err file in yr home directory and see
if X itself is reporting errors.

I hope this message will be helpful to you...

-Bill Cassady
_______________________________________
On Sat, 4 Jan 2003, Bruce Douglas wrote:

> Date: Sat, 4 Jan 2003 10:46:21 -0800
> From: Bruce Douglas <bedouglas "at" earthlink.net>
> To: vnc-list "at" realvnc.com
> Subject: RE: vnc .. black vnc client screen
>
> update...
>
> went back to the beginning...
>
> for server:
> 1) loaded redhat 8.0 linux onto a clean box
> 2) copied latest version of VNC server from realvnc site (rpm for redhat
> 7.3)
> 	(didn't know how to build the tar version, but this shouldn't be an
issue)
> 3) modified xstartup file for gnome
> 4) rebooted linux box
>
> i'm not going through any firewalls.. the client box is a windows 2000
box.
> the server is
> a linux redhat 8.0 box.
>
> for client:
> 1) verified via the java browser... http://foo.com:5801 (works)
> 2) used the vncviewer client
> 	the client starts a window. the window is blank/black. gnome does not
seem
> to start
>
> 	the log file results are:
>
> =======================================================================
> [root "at" lserver1 root]# more .vnc/lserver1:2.log
> 04/01/03 06:45:01 Xvnc version 3.3.6 - built Dec  2 2002 10:54:00
> 04/01/03 06:45:01 Copyright (C) 2002 RealVNC Ltd.
> 04/01/03 06:45:01 Copyright (C) 1994-2000 AT&T Laboratories Cambridge.
> 04/01/03 06:45:01 All Rights Reserved.
> 04/01/03 06:45:01 See http://www.realvnc.com for information on VNC
> 04/01/03 06:45:01 Desktop name 'X' (lserver1:2)
> 04/01/03 06:45:01 Protocol version supported 3.3
> 04/01/03 06:45:01 Listening for VNC connections on TCP port 5902
> 04/01/03 06:45:01 Listening for HTTP connections on TCP port 5802
> 04/01/03 06:45:01   URL http://lserver1:5802
> SESSION_MANAGER=local/lserver1:/tmp/.ICE-unix/1028
> Loaded background '0x8095970
> Xlib:  extension "RENDER" missing on display ":2.0".
> Xlib:  extension "RENDER" missing on display ":2.0".
> Xlib:  extension "RENDER" missing on display ":2.0".
> Unable to open desktop file applications:///Internet/redhat-email.desktop
> for pa
> nel launcher: Error reading file
> 'applications:///Internet/redhat-email.desktop'
> : File not found
> Unable to open desktop file
> applications:///Office/redhat-word-processor.desktop
>  for panel launcher: Error reading file
> 'applications:///Office/redhat-word-proc
> essor.desktop': File not found
> Unable to open desktop file
> applications:///Office/redhat-presentations.desktop
> for panel launcher: Error reading file
> 'applications:///Office/redhat-presentati
> ons.desktop': File not found
> Unable to open desktop file
> applications:///Office/redhat-spreadsheet.desktop fo
> r panel launcher: Error reading file
> 'applications:///Office/redhat-spreadsheet.
> desktop': File not found
> Xlib:  extension "RENDER" missing on display ":2.0".
>
> 04/01/03 06:45:38 Got connection from client 192.168.1.3
> 04/01/03 06:45:38 Protocol version 3.3
> 04/01/03 06:46:01 Client 192.168.1.3 gone
> 04/01/03 06:46:01 Statistics:
> 04/01/03 06:46:01   key events received 0, pointer events 4
> 04/01/03 06:46:01   framebuffer updates 0, rectangles 0, bytes 0
>
>
============================================================================
> ======
>
> the xstartup file is:
>
> -----------------------------------------------
> #!/bin/sh
> #unset SESSION MANAGER
>
> [ -r $HOME/.Xresources ] && xrdb $HOME/.Xresources
> xsetroot -solid grey
> xterm -geometry 80x24+10+10 -ls -title "$VNCDESKTOP Desktop" &
>
> unset SESSION MANAGER
>
> gnome-session &
> #bed twm &
> -----------------------------------------------
>
> the bottom line.. i'm still having the same issues that i've been dealing
> with
> for the past couple of days... the weird thing is that this was initially
> working,
> or at least i thought it was...
>
>
>
>
> [root "at" lserver1 root]#
> -----Original Message-----
> From: vnc-list-admin "at" realvnc.com [mailto:vnc-list-admin "at" realvnc.com]On
> Behalf Of Bruce Douglas
> Sent: Saturday, January 04, 2003 3:38 AM
> To: vnc-list "at" realvnc.com
> Subject: RE: vnc .. black vnc client screen
>
>
> -----Original Message-----
> From: Bruce Douglas [mailto:bedouglas "at" earthlink.net]
> Sent: Saturday, January 04, 2003 3:33 AM
> To: 'Bruce Douglas'
> Subject: RE: vnc .. black vnc client screen
>
>
> hi...
>
> ok.. now this is simply getting more confusing!!!!
>
> i've decided to go back and start fom the beginning...
>
> how does one completely remove/uninstall the vnc package. (is there an
> uninstall rpm function within linux??)
>
> what are the correct steps for building/installing a vnc server for a
redhat
> (8.0) linux platform???
>
> i've seen plenty of msgs that point to a "/etc/sysconfig/vncservers" file.
I
> don't have this file on any of the boxes where i've selected vnc from the
> linux/redhat distro when i was installing linux. in fact, i can't seem to
> find vnc on any of the boxes where i've tried to install vnc as part of
the
> linux install process. (i've only had it initially work when i did the vnc
> install by hand...)
>
> so, in essence, i'm trying to find some form of docs/pointers to a
sequence
> of steps for installing the VNC server on a linux box in a repeatable
> fashion....
>
> the docs that i found on the realvnc site weren't that helpful.
>
> by the way, where does the vncservers file come from, and what should be
in
> it. is there any doc/set of docs that describes the various setup files
> required and what they should include.
>
> Thanks
>
> Bruce
>
>
> -----Original Message-----
> From: vnc-list-admin "at" realvnc.com [mailto:vnc-list-admin "at" realvnc.com]On
> Behalf Of Bruce Douglas
> Sent: Friday, January 03, 2003 10:11 PM
> To: vnc-list "at" realvnc.com
> Subject: RE: vnc .. black vnc client screen
>
>
> hi...
>
> my lserver2:2.log file follows:....
>
> 03/01/03 08:57:12 Xvnc version 3.3.6 - built Dec  2 2002 10:54:00
> 03/01/03 08:57:12 Copyright (C) 2002 RealVNC Ltd.
> 03/01/03 08:57:12 Copyright (C) 1994-2000 AT&T Laboratories Cambridge.
> 03/01/03 08:57:12 All Rights Reserved.
> 03/01/03 08:57:12 See http://www.realvnc.com for information on VNC
> 03/01/03 08:57:12 Desktop name 'X' (lserver2:1)
> 03/01/03 08:57:12 Protocol version supported 3.3
> 03/01/03 08:57:12 Listening for VNC connections on TCP port 5901
> 03/01/03 08:57:12 Listening for HTTP connections on TCP port 5801
> 03/01/03 08:57:12   URL http://lserver2:5801
> SESSION_MANAGER=local/lserver2:/tmp/.ICE-unix/904
> Loaded background '0x8097490
> AUDIT: Fri Jan  3 08:57:19 2003: 896 Xvnc: client 4 rejected from local
host
> Xlib:  extension "RENDER" missing on display ":1.0".
> Xlib:  extension "RENDER" missing on display ":1.0".
> Xlib:  extension "RENDER" missing on display ":1.0".
> Unable to open desktop file
> applications:///Office/redhat-word-processor.desktop
>  for panel launcher: Error reading file
> 'applications:///Office/redhat-word-proc
> essor.desktop': File not found
> Unable to open desktop file
> applications:///Office/redhat-presentations.desktop
> for panel launcher: Error reading file
> 'applications:///Office/redhat-presentati
> ons.desktop': File not found
> --More--(84%)
>
>
> my xstartup is below...
>
> [root "at" lserver2 root]# more .vnc/xstartup
> #!/bin/sh
>
> unset SESSION MANAGER
>
> [ -r $HOME/.Xresources ] && xrdb $HOME/.Xresources
> xsetroot -solid grey
> xterm -geometry 80x24+10+10 -ls -title "$VNCDESKTOP Desktop" &
>
> #bed twm &
> gnome-session &
>
>
> I still cnnot figure out why i'm getting a blck screen when i try to
connect
> via a Windows vncviewer. I believe whatever I'm experiencing is also
causing
> my Windows box to consume all CPU cycles. As I stated earlier... the http
> java client performs as I expect.
>
> thanks....
>
> bruce
> bedouglas "at" earthlink.net
>
>
> -----Original Message-----
> From: vnc-list-admin "at" realvnc.com [mailto:vnc-list-admin "at" realvnc.com]On
> Behalf Of Bruce Douglas
> Sent: Friday, January 03, 2003 2:47 PM
> To: vnc-list "at" realvnc.com
> Subject: RE: vnc .. black vnc client screen
>
>
> ps...
>
> my xstartup file (.vnc/xstartup) is....
>
> /////////////////////////////////////////////////////////////////
> [ -r $HOME/.Xresources ] && xrdb $HOME/.Xresources
> xsetroot -solid grey
> xterm -geometry 80x24+10+10 -ls -title "$VNCDESKTOP Desktop" &
>
> #bed twm &
>
> gnome-session &
> /////////////////////////////////////////////////////////////////
>
> -bruce
>
>
> -----Original Message-----
> From: vnc-list-admin "at" realvnc.com [mailto:vnc-list-admin "at" realvnc.com]On
> Behalf Of Bruce Douglas
> Sent: Friday, January 03, 2003 2:11 PM
> To: vnc-list "at" realvnc.com
> Subject: vnc .. black vnc client screen
>
>
> Hi...
>
> A simple question (I hope!!). I can run the vnc browser (java) and I see
the
> unix box (GNOME) as I should)....
>
> In keeping everything simple, I'm trying to fire up a Windows VNC Client
to
> talk to a Linux VNC Server.
>
> However, When I run the VNC Client (Windows) a black window is displayed.
> This used to work before (I think)!!! I've done a lot of rewiring/etc.. I
> can't really say that everything has actually worked on this box!!
>
> I run vncserver on the unix box. It appears that I have multiple VNC
> displays running. I'm new to unix, so I don't know how to go about
actually
> checking to see which displays are actually running.
>
> Any help/assistance would be greatly appreciated. Or any pointers to
online
> docs/etc....
>
> Thanks
>
> Bruce Douglas
> bedouglas "at" earthlink.net
>
> PS. As I stated, I could have sworn that I had everything working at one
> time!!!
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caersidi "at" sdf.lonestar.org
SDF Public Access UNIX System - http://sdf.lonestar.org
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