Add New Client

[Anson Ng]

I'm running Listening VNC Viewer (RealVNC 4.1.2) on a host behind a 
router with port 5900 forwarded (both TCP and UDP).  And then when 
another host from the WAN with VNC Server 4.1.2 tried to Add New Client 
and type the IP address of my router, it gets a "Connection Failed" 
error after about 20 (I guess it's a timeout).  This is also true even 
when I run both the viewer and server on the same host behind the 
port-forwarded router, when I typed the external IP address of the 
router in the viewer text field of Add New Client, I got the same error.

When you issue Add New Client from a VNC server, does it use another 
port other than 5900?

Thanks,
Anson