If you want us to pursue investigating this problem we'll need you to send us the information on how exactly you have set up your server including how you generated your certificates, and how exactly you have set up your client including all the configuration and how you generated the certificates. I do believe though that along the way in the investigation we may end up finding a problem in your certificates. Since you can reproduce a difference between 3.2.3 and 3.3.1, this is something we should be able to reproduce here as well, if we have all the necessary information.

More than likely there is something actually wrong with the certificates, or something changed in terms of security requirements that now fails these certificates. While it is technically possible there is a bug in 3.3.1, I highly doubt it - we test over a hundred different configurations and it all passed. It is a common problem if mistakes have been made in setting up the certificate infrastructure. Peer certificate verification failure means that the certificate offered by the other side cannot be verified.

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