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It would probably be an uncommon thing, but I thought that maybe one of the other machines on the network, might have a modem, and it's user had a program, that allows him to dial in from home and take command of his machine at work. If you are in a country that the phone company charges by the minute for local calls, this would be unlikely. Just pulling at straws, trying to figure out why a machine could be up with no one in the building.
Netstat is a good command, only it just lets you look at things in 'real time'. You can look at the connections your machine is making, but as far as I know it has no way to set up logging. That's why I kind of hoped that logging was an option on your proxy server program. I have no Idea why your proxy would seek a connection, if a client wasn't calling for it, unless maybe it thought it needed a DNS server for ?something? and dialed the isp for it. Usually a dedicated proxy has the bare minimum of other programs running on it. No other good ideas, however.
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