Looks like centost5 is hitting its limit:
Date: Fri, 18 Jul 2014 07:54:03 -0700 (PDT)
msync.CentOS.org rsync service (centost5) ---------------------------------------
This service is intended for the sole use of the CentOS worldwide mirror network to synchronize mirrors.
Unless you are running or intending to run a listed public CentOS mirror use a mirror listed at http://centos.org/download/mirrors
If you intend to populate a mirror for public use please read the notes at http://wiki.centos.org/HowTos/CreatePublicMirrors
If you do use this service then it is implied that you are providing a mirror for public use and giving us authority to publicise such mirror.
@ERROR: max connections (40) reached -- try again later rsync error: error starting client-server protocol (code 5) at main.c(1503) [receiver=3.0.6]