Why Does My cURL Request Fail with Error 60: SSL Certificate Issues?

Curl Error 60: Understanding SSL Certificate Issues

When attempting to execute a cURL request to obtain an access token from a remote server, users may encounter an error message related to an invalid SSL certificate in the certificate chain.

This occurs due to a lack of an up-to-date bundle of CA root certificates in the PHP installation used to execute the cURL request. These certificates are essential for cURL to verify the authenticity of the remote server's SSL certificate.

To resolve this issue, follow these steps:

• Obtain the CA Root Certificates: Visit the provided link (http://curl.haxx.se/docs/caextract.html) to download the latest bundle of CA root certificates.

• Configure PHP Settings:

  • php.ini: Add the following line to your php.ini configuration file:

    curl.cainfo = <absolute_path_to> cacert.pem

  • Runtime: If you prefer setting the CA certificate at runtime, use:

    curl_setopt ($ch, CURLOPT_CAINFO, dirname(__FILE__)."/cacert.pem");

Once these steps are complete, your cURL request should successfully access the remote server and retrieve the access token without encountering the SSL certificate error.

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