I receive messages like this from cron often. Not every hour, and not consistently between the servers running CentOS, but at least two per day. Is this normal?

/etc/cron.hourly/0yum-hourly.cron:

Could not retrieve mirrorlist http://mirrorlist.centos.org/?release=7&arch=x86_64&repo=os&infr... error was

14: HTTP Error 403 - Forbidden

Could not retrieve mirrorlist http://mirrorlist.centos.org/?release=7&arch=x86_64&repo=extras&... error was

14: HTTP Error 403 - Forbidden

Could not retrieve mirrorlist http://mirrorlist.centos.org/?release=7&arch=x86_64&repo=updates&... error was

14: HTTP Error 403 - Forbidden