ERR_SSL_PROTOCOL_ERROR

one common reason for above error could be due to the HTS (HTTP Strict Transport Security: a way for sites to elect to always use HTTPS). which is the browser always enforce the https protocol for the domain regardless requested.

to disable this in chrome, go to chrome://net-internals/#hsts

1. confirm the domain is already included for HTS
Query HSTS/PKP domain
Input a domain name to query the current HSTS/PKP set:

Domain: (the domain facing the issue)

Screenshot 2019-08-12 at 9.48.21 PM

2. then delete the domain
Delete domain security policies
Input a domain name to delete its dynamic domain security policies (HSTS and Expect-CT). (You cannot delete preloaded entries.):
Screenshot 2019-08-12 at 9.49.06 PM

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