I tried installing x11vnc using the instructions on the following page, but 
but when trying to connect I just get "connection refused (111)".

 * https://wiki.edubuntu.org/InstallX11VncOnLtspClients

I have killed the process on the client and run manually, but it completes 
without ever stating "PORT=5900" as you would expect, even if I specify the 
port number on the command-line.

Sure enough, if I run "netstat -ant" before and after x11vnc, no additional 
ports appear.

I have installed nmap on the client and run "nmap localhost" but this states 
that the host is down.  "nmap -sT -P0 -p 5900 localhost" returns:

 PORT     STATE     SERVICE
 5900/tcp filtered  vnc

If from the server I run "nmap -sT -P0 -p 5900 <clientip>" then it returns:

 PORT     STATE  SERVICE
 5900/tcp closed vnc

And just as a final test "nmap <clientip>":

 PORT     STATE SERVICE
 6007/tcp open  X11:7

So no great surprise that it's not working, but I am at a loss to know why 
x11vnc cannot activate the port.

I don't believe there is any firewall running on either client or server, and 
both are on the same subnet (LTSP server was installed with a single NIC); so 
I don't believe any other firewall should be influencing things.

I've spent the best part of two days going around in circles with this, so any 
pointers gratefully received.

Thanks!
-- 
Chris Roberts

LTSP Version    : 5.1.10-1~40
Windows Manager : KDE 3.5.5
Distribution    : Debian Etch
Kernel          : 2.6.22-3-k7

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