Hello, the address of Japanese mirror KDDI has changed recently as follows. KDDI R&D Labs (Saitama, Japan) FTP: ftp://ftp.kddilabs.jp/Linux/packages/scientificlinux/ HTTP: http://ftp.kddilabs.jp/Linux/packages/scientificlinux/ HTTP: http://ftp.ne.jp/Linux/distributions/scientificlinux/ RSYNC: rsync://ftp.kddilabs.jp/scientificlinux/ So that, please edit URLs at Downloading Scientific Linux: https://www.scientificlinux.org/download/ Regards, Green.