I have the same problem. I get a "can't find address" type message when I try to connect from home.
But, as I wrote to Mark, the really strange thing is that I sometimes do get a working connection going with the same isp, same computer, same browser.
Mark doesn't know what to make of it either. I hope, problems like these resolve themselves like butters. heh.
I had the same thing happen for the last three days here at work. Today they turned off the proxy server and everything is fine now. Maybe this could be your problem.?