wp-cron.php Peer certificate cannot be authenticated

List,

I am a new user of WP, having just built our new office Internet with a local install of v.3.6.1. Everything seems to be working great.

I am now finishing up the build by setting up a site backup plan. I installed the BackUpWordPress plugin as my first shot at this. Everything installed correctly but I received an error. I then installed the WP Crontrol plugin to better manage the WP cron – but am receiving the same error.

“There was a problem spawning a call to the WP-Cron system (wp-cron.php) on your site. This means WP-Cron jobs on your site may not work. The problem was:
Peer certificate cannot be authenticated with known CA certificates”

Question: How do I fix this certificates problem?

I have searched all over the Codex (and googled too), but have not found any help. Ideas are most appreciated!