UltraVnc Port Forwarding with Nat Routers

If UltraVNC server and viewer are on different sides of a NAT router and you won't use a repeater or NAT-to-NAT connector, you need to do some configuration on the router.

Here are some links to detailed configuration instructions for specific router types.

A general overview about port forwarding is given in What is Port Forwarding?

Router configuration

Firewall configuration