Update 1/12/18:
The fix for the BLTI error needs to be done on Gale's side individually for each library that is experiencing it.
If your library is experiencing this error, please contact me so we can alert Gale and resolve the issue.
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Some libraries are encountering an BLTI error page when they try to access TERC off-campus.
"BLTI Authentication failed
Error Code - Please return to your site and log in."
We are in communication with Gale about this and are working on a solution. We will update you when we have more information.