freebsd-update mirror, not working

[donggaord]

Hi,

Do the instructions in https://mirror.bjtu.edu.cn/help/freebsd/ really work? I'm running 14.1 and looking to update the system. I followed the instructions:
"编辑#ee /etc/freebsd-update.conf 文件:
将ServerName update.FreeBSD.org 修改为ServerName mirror.bjtu.edu.cn"

Then I ran # freebsd-update fetch and it just failed.

Looking up mirror.bjtu.edu.cn mirrors... none found.
Fetching metadata signature for 14.1-RELEASE from mirror.bjtu.edu.cn... done.
Fetching metadata index... done.
Fetching 2 metadata patches.. done.
Applying metadata patches... done.
Fetching 2 metadata files... failed.```