It is common practice in corporate networks that connect MS Windows machines to 
redirect all (encrypted included) traffic through company's router.  For this 
purpose routers are usually configured to act as a CA.  However, the 
certificate issued by such "CA" will of course not be found in the certificates 
distributed with LibreSSL (how would they even know?).  MS Windows networking, 
however, has a way to configure these policies.

Prior to this issue, Python relied on the OS libraries to implement TLS 
protocol, so the overall setup worked transparently for users.  Since 3.6.5, 
however, this is no longer possible (requires alteration of certificates 
distributed with Python).

I'm asking that this be made configurable / possible to disable using simple 
means, perhaps an environment variable / registry key or similar.

PS. I still cannot register to the bug tracker (never received a confirmation 
email), this is why you are reading this email.

- Best.

Oleg
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