Eclipse Indigo “unable to connect to repository”

Question

I\'m trying to add this repository to Eclipse (Indigo):-

http://download.eclipse.org/releases/indigo

Seems okay when checked in a browser, but I keep getting

Answer 1

I used VonC's answer to good effect. I also uninstalled a program called webroot. I think this had something to do with it because other programs were also having network problems.