What are common reasons for encountering a CURL error code 56 when using a proxy in PHP?

CURL error code 56 typically occurs when there is a failure in the SSL verification process while using a proxy in PHP. This can happen due to issues with the SSL certificate of the proxy server or misconfiguration of the SSL settings in the cURL request. To solve this issue, you can disable SSL verification for the cURL request by setting the CURLOPT_SSL_VERIFYPEER option to false. 

$url = 'https://example.com';
$proxy = 'proxy.example.com:8080';

$ch = curl_init();
curl_setopt($ch, CURLOPT_URL, $url);
curl_setopt($ch, CURLOPT_PROXY, $proxy);
curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false); // Disable SSL verification
$result = curl_exec($ch);

if($result === false) {
    echo 'Error: ' . curl_error($ch);
}

curl_close($ch);

Keywords

CURL error code 56 proxy PHP troubleshooting

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