ZlibHex Error

[jsdey@optonline.net]

Hi:

I have seen some reported difficulties with ZlibHex protocol or 
whatever.  I am not familiar with the frame buffering technology.  Here 
my problem:

I am using "Chicken of the VNC" V. 1.3.6 on a Mac G5.  When I connect 
to a WinXP machine on my local network using WinVNC V 3.3.7 server, the 
system works perfectly.
However, the original purpose was to be able to run my mother WinXP 
box.  When I try to connect over the Internet (using the same version 
of the server),
I see a black screen for a few seconds and then a error window appears 
on my Mac that says "ZlibHex unknown subencoding error 300 
encountered".

Any practical advise as to how to correct this situation wouldl be 
greatly appreciated.  Thanks.