Thanks !

Your mirror http://mirrors.nxtgen.com/centos-mirror/ has been added to the mirrors DB

It will be listed as a public mirror (and on https://mirror-status.centos.org / https://www.centos.org/download/mirrors/ ) in the following minutes/hours.
Your IP address[es] (103.56.39.228 ) has/have been added in the ACL and so you should be able to rsync from msync.centos.org in the next ~10min

Important : it only concerns CentOS Linux 7 and Stream 8. For Stream 9 and above, read (again) https://wiki.centos.org/HowTos/CreatePublicMirrors

Kind Regards