Ok so the connection seems to work. No extreme congestion on the network connection. Though the variance in round trip times seems a bit large. But should not matter though.

Just to be safe. Are you sure you are connected to WiFi when you tried to use apt-get from the terminal?

Though you could try this as well.
At the moment the IP address that I seem to get for downloads.maemo.nokia.com is 206.132.241.74.

Therefore you could create another repository there with the following data and check if everything works. The idea here is that you will get the same server that I'm using and everything works. You just make a copy of Nokia repository and change the domain name as the IP-address that I'm using. I think Nokia gives you another repository address based on your country to share the load more evenly.

"Nokia backup" or something like that
"https://206.132.241.74/fremantle/apps/"
"./"
" "

Remember to disable the Nokia repository for the time. I think you can use the same for the software update repo as well (change domain to IP and make a backup repo.