Nice catch ! well, you need the template ! 
Related post :
https://meta.discourse.org/t/when-all-users-come-from-127-0-0-1-new-registrations-are-blocked/29533
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One final question: I have the habbit of updating via rebuild rather than admin front-end. Would this issue have been triggered by using the front-end upgrade feature?
Yes, it would have failed either way.
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