VNC Via ssh tunnel

Hello, 

 

  I am having difficulty establishing vnc connections via an ssh tunnel.
We have a series of independent LANs, each one has one computer with an
interface to the wider network.  I need to be able to VNC through this
gateway computer to any other computer on the internal network.  I have
been attempting to do this using an ssh tunnel, but it doesn't  always
work.  

 

  I first establish the tunnel on the gateway machine with:

 

/usr/bin/ssh -L localport:remoteIP:5900 localhost sleep 60

 

  to allow the tunnel to expose a unique port for each computer inside
the network and attempt to connect to that port with vncviewer.

 

So if I want to make a VNC connection to 192.168.103.12, I would set up
the tunnel 

 

/usr/bin/ssh -L 12345:192.168.103.12:5900 localhost sleep 60

 

  and connect to "vncviewer gateway:12345"

 

This seems to work about 50% of the time.  The rest of the time I get

 

main:        unable to connect to host: Connection refused (111)

 

It is more likely to connect when running realvnc from windows than
linux, but still not 100% of the time.

 

 Has anyone done anything similar?  Am I missing something very obvious
here?

 

 Thanks for your help

 

James

 

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