If you're trying to watch Teaching Channel videos from your school or organization's network, it's possible that your access to the videos is being blocked.
Reach out to your technology department and explain that you are trying to watch videos from TeachingChannel.org. Our videos are hosted by JW Player, which may be blocked by your network's firewall or content filter. You will need to unblock or whitelist:
jwplatform.com
*.jwpsrv.com
jwpcdn.com
jwpltx.com
jwpsrv.a.ssl.fastly.net
cdn.jwplayer.com
There is a test page to help diagnose which domain(s) are getting blocked on your network. In cases where a firewall is blocking the requests, we expect that clicking on the second link (that appears under the player when the error message appears) will take you to a page loaded by your network's firewall, usually requiring authentication to proceed.