Block incoming connection from ARDAgent?

Since I installed Snow Leopard, I have a window that pops up and tells me if I want to block incoming connection from ARDAgent(Remote Desktop App) every time I log in or turn on the computer, no matter if I block or allow incoming connections. Can anyone tell me how to stop this?

The blocking of incoming connections is in System Preferences>Security>Firewall
I think (not in front of a Mac at the moment). I would have thought that once
disabled it would remain disabled. Are you running in an admin account?
Dave

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