When using prozilla in portage, it searches for mirrors to download the files from. I would surgest, that it looks for mirrors at: http://www.filemirrors.com
The graphical version of prozilla (which might not be in portage) actually searches some sites that work. They really need to upgrade the prozilla in portage...
Related to #1661
how is this a portage bug? Looks more like a prozilla issue.
Closing as I don't see the point.