When you run VNCviewer in listen mode, the viewer waits for the server to
initiate a connection on port 5500. The server initiates the connection to
the viewer either by Add New Client from the servers tray icon or with
the -connect command line option. So far, so good.

Is there a way to get the VNCviewer in listen mode to listen on a port other
than 5500? If so, how? And how does one tell the server what port the
listening viewer is listening on?

In case anyone is interested, here's why this would be a useful feature:

I run a number of VNC servers behind a firewall. Although they are VNC
servers, in fact they are people's personal computers that I need to do help
desk "watch me do it" kind of sessions on. Because I don't want to open them
up to the risk that they will be attacked, I have blocked all unsolicited
inbound traffic through the firewall. Because, by definition, there will be
someone at the keyboard when I take the helm, it's okay that the VNC server
has to initiate the connection. Since the VNC server initiates the VNC
session, the firewall allows the VNC traffic.

On the other side of the firewall, at the VNCviewer end, I have a NAT box
protecting that network. If I tell the NAT box to reroute inbound traffic on
5800 to a particular machine, all is well, but that means the servers can
relinquish control to only one listen mode viewer. I would like to have
several VNC viewers all in listen mode behind the NAT box listening on say
5801, 5802, 5803, ... and to tell the NAT box that when it receives
unsolicited inbound traffic on 5801 that it should reroute it to 5801 on one
machine and when it receives traffic on 5802 that it should reroute it to a
different machine.
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