VNC works; firewall question

[Calef, Travis]

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Hello from a newbie to this list.

I checked the FAQ and saw some sparse information about using VNC
through a firewall, but nothing specific enough for me to use.  I'm
hoping someone has had the same configuration issues and can clue me in
as to what's wrong.

We are running VNC on a DEC Unix box, using Java-enabled web browsers to
access our X windows app.  It all works beautifully here on the local
network.  What we are interested in doing is being able to have a
prospective customer point their browser to the server and watch a
remote demonstration of our software.  

On our firewall, I have enabled all WWW traffic to the Unix server here,
and also specifically opened up ports 5801, 5802, and 5803 to that box.
However, I am unable to access VNC through the firewall.  Does anyone
know if there are additional ports or settings that need to be changed?



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