PHP CURL request with PEM certificate unstable results - php

Question

I'm trying to get results from a server which is protected with an PEM cerficate and private key.
I have results, but it is unstable. Most of te time i have response, sometimes an Curl error: NSS: private key from file not found.
The code:
$url = escape($this->url).'/jira/rest/api/2/project';
// Variables
$apiGrantType = 'client_credentials';
$cliendId = $this->username; // Client ID
$clientSecret = $this->password; // Client Secret
$certUserPwd = $cliendId . ":" . $clientSecret; // Client ID:Client Secret
$certFile = PATH_FILES.'certificate/cert.pem'; // Private Cert
$certKey = PATH_FILES.'certificate/key.pem'; // Private Cert
$certPassword = '*****'; // Cert Password
$curl = curl_init();
curl_setopt($curl, CURLOPT_USERPWD, PWSTR);
curl_setopt($curl, CURLOPT_URL, $url);
//curl_setopt($curl, CURLOPT_RETURNTRANSFER, 1);
//curl_setopt($curl, CURLOPT_FOLLOWLOCATION, 1);
curl_setopt($curl, CURLOPT_SSLCERT, $certFile);
curl_setopt($curl, CURLOPT_SSLKEY, $certKey);
curl_setopt($curl, CURLOPT_SSLKEYPASSWD, $certKey);
//curl_setopt($curl, CURLOPT_TIMEOUT, 30);
//curl_setopt($curl, CURLOPT_VERBOSE, 1);
if(!$exec = curl_exec($curl))
{
echo 'Curl error: ' . curl_error($curl);
}
dump($exec);
Sometimes it runs perfectly and returns the requested response.
Othertimes it return Curl error: NSS: private key from file not found.
Server where request is calling from is running on CENTOS 7 and PHP 7.2.
How can i make my request stable?

Answer 1

I know this is an old thread, but recently had same issue.
Based on the above code, it looks like the curl definitions are within a class, and that one is used with include/include_once or require/require_once.
In my case seems that using include_once/require_once was the reason, hence
you can replace any include_once/require_once in favour of include/require.
alternatively use something like
if (!class_exists('some_class')) {
include 'some_path/some_class.php';
}