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Could not find a version that satisfies the requirement Flask pip install -U Flask

Collecting Flask Could not fetch URL https://pypi.python.org/simple/flask/: There was a problem confirming the ssl certificate: [SSL: TLSV1_ALERT_PROTOCOL_VERSION] tlsv1 alert protocol version (_ssl.c:590) - skipping

Could not find a version that satisfies the requirement Flask (from versions: )

No matching distribution found for Flask

davidism
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ta it
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    Possible duplicate of [Not able to install python packages \[SSL: TLSV1\_ALERT\_PROTOCOL\_VERSION\]](https://stackoverflow.com/questions/49768770/not-able-to-install-python-packages-ssl-tlsv1-alert-protocol-version) – Anupam May 03 '18 at 06:47

1 Answers1

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This is cause by flakiness in PYPI CDN, which was migrated mid April 2018.

We still encounter these problems every day, probably in 1% of builds.

I tried to get an ack on #pypi irc channel but getting the issue confirmed is still a TODO.

sorin
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