I have a dual booted Windows XP and Ubuntu 10.10 box (AMD64) and have an unusual problem in that after connecting to the internet on Windows I cannot connect using Ubuntu. I don't believe it is actually a problem with configuring my Ubuntu connections because when I get up in the morning Ubuntu connects without any problem - this problem only exists (and persists for at least several hours) if I try to connect using Ubuntu immediately after connecting using Windows. I don't know how long the problem actually lasts because I usually just go to bed and then in the morning I can connect without problems. It is not problem with my provider's service as I have a second Ubuntu 10.10 box which I manually connect and works even when the dual booted one (on Ubuntu) won't. It is a particular problem with the dual booted box. A power down reset does not solve the problem.