Of course I cannot prove it isn't an issue with curl. curl has lots of issues. But you need to stop talking about Apple products and start talking about curl for us to understand.

Which curl version is it? And I assume this version is built with darwinssl as a TLS backend?

Can you try the current git version and see if it works differently? Is it only client certificates you have problems with? You say Python works, but that's not using darwinssl, is it?

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** [bugs:#1417] Yosemite Beta 6 - curl Error 58, 'SSL: Can't load the certificate'**
**Status:** open
**Labels:** yosemite beta 6 
**Created:** Wed Aug 27, 2014 04:23 PM UTC by Paul
**Last Updated:** Tue Sep 02, 2014 11:42 PM UTC
**Owner:** Daniel Stenberg
In Yosemite beta 6, an error occurs when trying to do certificate authentication. The certificates are valid. When not using curl the communication works as expected and does not error.
431 ERROR (58, 'SSL: Can't load the certificate "/path/to/client.pem" and its private key: OSStatus -25299')
curl info:
curl 7.37.1 (x86_64-apple-darwin14.0) libcurl/7.37.1 SecureTransport zlib/1.2.5
code base:
python - pycurl
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