Any ideas? VNC freezing via Netgear Router and broadband, inbound only

[Betsy Schwartz]

I asked this a few months ago and received no replies, wondering if I'm the 
only one with this problem:

I'm running WinVNC 3.3.3 R9, as a service,  on a Win2k SP 2 server. My home 
server is behind a Netgear RP614 router hooked up to a cable modem. I've 
tried assorted VNC clients, on assorted Win2k laptops, from three different 
remote locations.

When I connect to my server from outside,  the connection times out after 
about five minutes or so of idle time; the screen shows as frozen with the 
little square cursor and I have to open a new session. This happens with 
both VNC and TightVNC clients. When I upgraded to RealVNC 3.3.4 client, 
that client freezes when *not* idle and the application becomes unresponsive.

When I bring my laptop home and plug it directly  in to the router, I can 
connect to
my server with no time outs. I also have no problems running a server on a 
work machine
and connecting to it from home going outbound through this router.

Please, any ideas of how to fix this?

thanks Betsy
PS I have the server set to Poll Console Windows Only and Poll Foreground
Window, a combination that was preventing some weirdness using Putty to
connect to HP (which I no longer need to do)