John Nagle added the comment:
To try this with the OpenSSL command line client, use this shell command:
openssl s_client -connect www.verisign.com:443 -CAfile cacert.pem
This provides more detailed error messages than Python provides.
"verify error:num=20:unable to get local issuer certificate" is the OpenSSL
error for "www.verisign.com". The corresponding Python error is "[SSL:
CERTIFICATE_VERIFY_FAILED] certificate verify failed (_ssl.c:581)."
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<http://bugs.python.org/issue23476>
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