Your school's firewall may be set up to block content from Vimeo.
To remedy this issue, contact your IT department and ask that they whitelist the following address: https://player.vimeo.com
Alternately, specific video URLs can be provided to limit access to only G-W content. If this is preferred, please ask your IT department to e-mail firstname.lastname@example.org. (Please provide the title of the content as part of the request.)