On 11/05/2021 18:06, Krishnakumar Masimalai wrote: > When we tried to sync from msync.centos.org::CentOS, we receive the > following error. > > rsync -aqzH --delete msync.centos.org::CentOS /mirror_repository/centos/ > > > @ERROR: Unknown module 'CentOS' > rsync error: error starting client-server protocol (code 5) at > main.c(1666) [Receiver=3.1.2] > > What might be the issue? , is that any thing missed out? > Hi, That means that the IPv4 you gave when you sent your mirror proposal (so 182.72.203.229) doesn't seem to be the one used by your server when doing rsync. Do you use NAT in front/firewall with so different outgoing IP address ? Or that you have IPv6 and you haven't asked for it to be added in the ACL ? curl http://icanhazip.com -- Fabian Arrotin The CentOS Project | https://www.centos.org gpg key: 17F3B7A1 | twitter: @arrfab