FreeBSD		synced with rsync://ftp-master.FreeBSD.org/FreeBSD/
distfiles	fetch from all original source provider.

Using ftp.tw.freebsd.org distfiles service, please modify your /etc/make.conf as below.
MASTER_SITE_OVERRIDE=https://ftp.tw.freebsd.org/pub/distfiles/${DIST_SUBDIR}/