This error occurs when either your computer or network is blocking access to our servers. As a result, LockDown Browser cannot access and then load your institution's LMS.
The main server is hosted on Amazon S3 ( Amazon Web Services) with "www.respondus.com" as the mirror. If the LMS login page is not being loaded, then both are being blocked. To troubleshoot this problem, the best place to start is to temporarily disable any firewalls and/or anti-virus software to see if that makes the difference.
If the problem persists, it's possible that the block might also be set in the router.