WinVNC server and AuthHosts

[MRZ]

Hello again.
According to the docs, an NT VNC server will bind to all available nics and there seems to be
only two workarounds to this without recourse to a third-party app.
The first, using loopback redirection - doesn't suit my needs so I'm using the second, which is
to set "AuthHosts" in the registry.
Also according to the docs is that a mouseover of the VNC icon in the system tray will show you
what connections are currently being allowed (in the format of IP address) which makes identifying
the restrictions fairly easy. 

The problem I'm having is that having set this registry entry, a mouseover 
indicates that both IP's are still allowed. I've stopped and restarted the VNC service but this
has made no difference.
I exported the appropriate line(s) from my NT registry for examination and pasted them below.
Where am I going wrong with this?

Thanks!
Marc.

Registry As follows:
[HKEY_LOCAL_MACHINE\SOFTWARE\ORL]

[HKEY_LOCAL_MACHINE\SOFTWARE\ORL\VNC]

[HKEY_LOCAL_MACHINE\SOFTWARE\ORL\VNC3.3.3]

[HKEY_LOCAL_MACHINE\SOFTWARE\ORL\WinVNC3]
"AuthHosts"="-:+192.168"

[HKEY_LOCAL_MACHINE\SOFTWARE\ORL\WinVNC3\Default]
"QueryTimeout"=dword:0000000a
   *OTHER SETTINGS HERE*
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