Connection refused (10061)

[Ray Davison]

The host machine is running WXP and free RealVNC 4.1.3.  I built it at 
this location and delivered it to the host location.  It is connected to 
Hughes satellite.  I also created a DYNDNS account for the host - 
https://www.dyndns.com/about/.

On the client here, using the same version RealVNC viewer under WXP I 
get "unable to connect to host: Connection refused (10061)".  I tried 
both DYNDNS and the IP from whatismyip.com that was transmitted by phone 
from the host.

I cannot find a definition for "10061".

Ideas?

TY
Ray