VNC viewer drop connection when connecting to Mac mini

[debbie]

I'm trying to use UltraVNC viewer, on Vista, to remote administer a Mac mini running Snow Leopard. I can use it for about 5-10 mins until it stops communicating with the Mac. A screen image remains, but you can't interact with it - and it doesn't update. Restarting the viewer recovers the connection.

I've tried 1.0.8.0 and 1.0.8.2 - both have the same problem. The viewer also "hangs" when I attempt to paste into a text box on the Mac (which I've seen mentioned by others).

Any idea what I can do to solve this? I don't want to have to go the KVM route.

[redge]

vncviewer auto mode ?
if yes, so easy to use LAN if your are on internal home network
I had tested from xp to imac 5.1 snow leopard up to date.
not yet tested vista to snow leopard

[debbie]

Seems like the problem is that the VNC display stops updating. If you connect a monitor to the Mac mini then the mouse gestures are still being processed - which is a little dangerous!

Does that help in diagnosing the issue?