I have a Netscreen NS5XT firewall. If I allow all ports to my server, which
is behind the firewall, the VNC connection works. If I allow only TCP ports
5801, 5901 and 5501 the connections fails. According to the documentation
these ports are the only ones I should open.

VNC runs as a service and I4ve mapped an ip address to the server, which I
guess is called "putting the server in the DMZ" in networking language. And
while all ports are open it works fine. But that4s not very safe, is it?

Marcus
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