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PayPal IPN SSL protocol version

I'm using IPN verification code from https://github.com/paypal/ipn-code-samples/tree/master/php

And the problem is that I get "cURL error: [35] Unsupported SSL protocol version" on live server. Everything is working fine with sandbox account on the stage server. Now the live server has even newer Curl version which is 7.42.1. What should I do?

Here is the var_dump(curl_version()); of both of the versions:

prntscr.com/e61mff - not working

prntscr.com/e61n42 - working

Solution

  • From the information included in the comment it can be seen that the non-working version of curl is using OpenSSL 0.9.8zf as the underlying SSL library. This version does not include support for TLS 1.2 which is required by Paypal. You would need at least OpenSSL 1.0.1 for TLS 1.2 support.