Повідомлення, що надісла(ла)в Howard Miller

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Honestly TL;DR. Sorry

Also, that ticket seems to assume the reader knows what problem it's fixing. It's not entirely clear to me. Presumably a problem that I don't have or don't know I have.
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Just to add - I had never heard of 'ngrok' and had to look it up.

I don't recall any discussions about it in connection with Moodle so, sorry, I suspect you'll be on your own here.

Having said that, we're always happy to answer any Moodle specific issues that might turn up (or try to, anyway).
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Sounds like a configuration issue with your web server.

This sort of thing is often caused by (in the case of Apache, anyway) by over-zealous configuration of tools like mod-security. Anyway, check your web server logs to see if it logged *why* it blocked that script and go from there.
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Sounds like some sort of Javascript issue. 

I would start by opening the Javascript console in your browser (F12 then select the 'Console' tab). Recreate the error(s) and check for any (red) error messages in the JS console.