In order to avoid throttling of the speed of my internet connection by my ISP while accessing nntp servers, I use a VPN connection while running Newsbin. I've used a number of different VPN services, including VyprVPN, and found that VPN connections frequently fail/disconnect. Such failures/disconnections result in Newsbin reconnecting to news servers using a non-VPN connection.
What can I do to force Newsbin to use only a VPN connection? Andif a VPN connection can't be used, prevent Newsbin from reconnecting using a non-VPN connection?