Repository timeout on different ISPs

[itsadok]

You can try one of the vault mirrors listed in https://mirrors.rockylinux.org/mirrormanager/mirrors (I see 5 currently)

For example:
http://mirror.nju.edu.cn/rocky-vault/8.7/BaseOS/x86_64/os/Packages/k/kernel-devel-4.18.0-425.3.1.el8.x86_64.rpm