[CentOS-mirror] Where is the upstream server

[TWAREN FTP]

Greetings,

    Does anyone know where is the CentOS upstream server?
    Now, I rsync from msync.centos.org, but sometimes got "Connection 
refused".
    I checked that msync.centos.org points to two IP address, 
66.29.48.168 and 76.79.76.39.
    66.29.48.168 seems not running rsyncd but 76.79.76.39 does.
    Does anyone know what happen to 66.29.48.168 or where I can sync from?
    Suggestion is welcome. :-)

Best Regards,
Sam