Blocked net

https://admin.fedoraproject.org/mirrormanager/

https://fedoraproject.org/server/download/

https://mirror.tuna.tsinghua.edu.cn/help/fedora/

change source

sudo sed -e 's|^metalink=|#metalink=|g' \
         -e 's|^#baseurl=http://download.example/pub/fedora/linux|baseurl=https://mirrors.tuna.tsinghua.edu.cn/fedora|g' \
         -i.bak \
         /etc/yum.repos.d/fedora.repo \
         /etc/yum.repos.d/fedora-modular.repo \
         /etc/yum.repos.d/fedora-updates.repo \
         /etc/yum.repos.d/fedora-updates-modular.repo