ZlibHex Error

James Weatherall jnw "at" realvnc.com
Tue Mar 23 15:27:00 2004

> 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".

ZlibHex isn't a standard part of the VNC protocol, so VNC Server 3.3.7 will
not produce ZlibHex data.  The error you're seeing suggests that CotVNC is
getting confused into intepreting incoming data as ZlibHex, even though it's

The most likely cause for things working locally but not remotely is that
CotVNC may be trying to switch to ZlibHex when it detects a slower network


Wez @ RealVNC Ltd.