Could not get metalink ... curl encountered end of file

I’m getting quite a lot of these in my mail file:

From root@rockstor.localdomain  Wed Oct  5 05:03:25 2016
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    id 83A76147D6A; Wed,  5 Oct 2016 05:03:25 -0400 (EDT)
From: "(Cron Daemon)" <root@rockstor.localdomain>
To: root@rockstor.localdomain
Subject: Cron <root@rockstor> run-parts /etc/cron.hourly
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X-Cron-Env: <XDG_SESSION_ID=1141>
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X-Cron-Env: <SHELL=/bin/bash>
X-Cron-Env: <PATH=/sbin:/bin:/usr/sbin:/usr/bin>
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Message-Id: <20161005090325.83A76147D6A@rockstor.localdomain>
Date: Wed,  5 Oct 2016 05:03:25 -0400 (EDT)

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

Could not get metalink https://mirrors.fedoraproject.org/metalink?repo=epel-7&arch=x86_64 error was
14: curl#35 - "Encountered end of file"

Any idea what that means / how to fix it?