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PYTHON-3015 Document cipher mismatch issues (#791)

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Bernie Hackett 2021-11-16 14:23:55 -08:00 committed by GitHub
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doc/examples/tls.rst
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@ -213,3 +213,21 @@ revocation checking failed::
[('SSL routines', 'tls_process_initial_server_flight', 'invalid status response')]
See :ref:`OCSP` for more details.
Python 3.10+ incompatibilities with TLS/SSL on MongoDB <= 4.0
.............................................................
Note that `changes made to the ssl module in Python 3.10+
<https://docs.python.org/3/whatsnew/3.10.html#ssl>`_ may cause incompatibilities
with MongoDB <= 4.0. The following are some example errors that may occur with this
combination::
SSL handshake failed: localhost:27017: [SSL: SSLV3_ALERT_HANDSHAKE_FAILURE] sslv3 alert handshake failure (_ssl.c:997)
SSL handshake failed: localhost:27017: EOF occurred in violation of protocol (_ssl.c:997)
The MongoDB server logs may show the following error::
2021-06-30T21:22:44.917+0100 E NETWORK [conn16] SSL: error:1408A0C1:SSL routines:ssl3_get_client_hello:no shared cipher
To resolve this issue, use Python <=3.10, upgrade to MongoDB 4.2+, or install
pymongo with the :ref:`OCSP` extra which relies on PyOpenSSL.