A bit more information:

When I open the details about the repositories that does not work is says:

"https://downloads.maemo.nokia.com/fremantle/ovi/./Packages
Resolving host times out: downloads.maemo.nokia.com"

"https://downloads.maemo.nokia.com/fremantle/ssu/mr0/./Packages
Resolving host times out: downloads.maemo.nokia.com"

"https://downloads.maemo.nokia.com/fremantle/ssu//apps/./Packages
Resolving host times out: downloads.maemo.nokia.com"

Can anybody tell me why this happens?