Cloudfront resources are isolated to the FQDN
Opening https://dlnmh9ip6v2uc.cloudfront.net/datasheets/Dev/Arduino/Shields/MP3_Player_Example.pde results in SOCKS_USERNAME="dlnmh9ip6v2uc.cloudfront.net"
. But instead of isolating to the FQDN we should do so using the domain name, i.e. cloudfront.net
.