From our Moodle host:
In order to ensure complete patching of OpenSSL the following site will be placed in maintenance mode, then rebooted during the listed maintenance window.
These patches have already been applied to the front end SSL for your site, but the reboot is a requirement for all services to run the fully patched OpenSSL version.
Hosted Site: http://moodle.middlebury.edu
Window: 1:00 AM to 5:00 AM EDT, May 20th, 2016
Please note the time zone specified above.