On 17 April 2018 at 19:46, Oleg Sivokon firstname.lastname@example.org wrote:
It is common practice in corporate networks that connect MS Windows machines to redirect all (encrypted included) traffic through company's router.
If this has only started happening recently, then the cause is more likely to be related to PyPI switching over to requiring TLS v1.2+ for all client access: a sufficiently outdated man-in-the-middle SSL/TLS proxy may not be able to meet PyPI's client security requirements. See https://pyfound.blogspot.com.au/2017/01/time-to-upgrade-your-python-tls-v12.... for more details.
(If that's the problem, it would affect all versions of Python equally though).
-- Nick Coghlan | email@example.com | Brisbane, Australia