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As part of our efforts to enhance our security, we’ve recently upgraded our servers to use TLSv1 as the minimum cryptographic protocol. This may cause some older implementation of SSL/TLS like openssl v0.9.x to fail. Some default python installations (notably the default installation on Mac OSX) link to the older version of
openssl libraries and try to negotiate an SSL connection that can prompt the following error when Python program tries to connect to our API:
[SSL: SSLV3_ALERT_HANDSHAKE_FAILURE] sslv3 alert handshake failure (_ssl.c:590)
If you are getting SSL handshake errors, check the output of the following command:
python -c "import ssl; print(ssl.OPENSSL_VERSION)" OpenSSL 0.9.8zh 14 Jan 2016
If your OpenSSL version is lower than 1.0.2, we recommend switching to a different Python distribution, such as Miniconda, which have new
openssl libraries linked.
This issue could also be fixed by first installing newer versions of Python and OpenSSL with Homebrew. Then, reinstall the
pyopenssl package by providing paths to the newer
openssl libraries. You can do this with the following commands:
$ brew install python $ brew install openssl $ sudo env ARCHFLAGS="-arch x86_64" LDFLAGS="-L/usr/local/opt/openssl/lib" CFLAGS="-I/usr/local/opt/openssl/include" pip install --upgrade --force-reinstall PyOpenSSL