A user of our pywbem package gets an SSLError with message "[SSL] EC lib (_ssl.c:728)" when invoking the connect() method on an SSL wrapped socket. See https://github.com/pywbem/pywbem/issues/1950.

The issue is that with this error message, it is not possible for us to figure out what the problem is and how to correct it.

This happens with CPython 3.5.

I have tried to find the place in _ssl.c (https://github.com/python/cpython/blob/3.5/Modules/_ssl.c) where a string "EC lib" or " lib" is created but did not find it there.

I have two requests:

1. Please explain what the reason is for this exception and what to change in the environment to make it work.

2. Please improve the message in this exception so that it is self-explanatory.