When I run the RealVNC Viewer in listening mode, are there any restrictions on the ports I can use?
Not from the vnc point of view.
Except the access of the port number can be hard since the display number cannot be negative...
I seem to have no problems if I listen on high numbers (5301, 5599, and a few other randomly chosen numbers of that ilk), the RealVNC Server connects quite happily to the viewer, but...
Wild guess, all randoms above 1024 work, below 1023 don't...
When I try lower numbers (I specifically want to be able to use port 80 for obvious firewall negating reasons) the server fails to get a connection.
This is a local system restriction. The port numbers below 1024 are regarded system ports or such. On some systems you need special privileges to use those ports, specially to connect services to them.
Kind of like the firewall restricts you to connect from the outside, the system restricts you at the inside.
btw: if you fancy access trough port 80 then it is most times to pass a firewall. Have you tried port 443 (the https port)?
At present I am only testing between two physically adjacent PCs on the same switch so this ought to be easy. Viewer on Win98 (192.168.0.5) and Server on NT4 (192.168.0.11) Both RealVNC 3.3.7 freshly downloaded.
.... why move to a different port????
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