Out of curiosity, what proxy software are you using? Just so I know that that sort of thing might be an issue if I encounter it in the future.

(Solaris has a similar annoying problem. It has a process called nscd that is the name service cache daemon, and it likes to cache way more than it should. It crops up often when changing IP addresses on a web server. Used to be that you could disable it temporarily using ``nscd -e hosts,no'', and they claim that you still can, but now there's a bug where you actually have to kill the process. Very annoying. But at least you don't have to reboot.)