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&infra=stock error was

14: HTTP Error 403 – Forbidden

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

14: HTTP Error 403 – Forbidden

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

14: HTTP Error 403 – Forbidden