Backup pfSense via PHP + cURL

[andresense]

I'm trying to hold up the pfSense through php + curl lib. But it reports the following error:

CSRF check failed. Your form session may have expired, or you may not have cookies enabled.

Code:

$camposPost = array (  'usernamefld' => 'admin', 'passwordfld' => 'password');

$ch = curl_init();

curl_setopt($ch, CURLOPT_URL, 'https://pfsense');
curl_setopt($ch, CURLOPT_COOKIEJAR, 'cookie.txt');
curl_setopt($ch, CURLOPT_COOKIEFILE, 'cookie.txt');

curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);
curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, false);
curl_setopt($ch, CURLOPT_COOKIESESSION, true);
curl_setopt($ch, CURLOPT_POST, true );
curl_setopt($ch, CURLOPT_POSTFIELDS, $fieldPost);
curl_setopt($ch, CURLOPT_HTTPHEADER, array("Expect:  "));

curl_setopt($ch, CURLOPT_FOLLOWLOCATION, 1);

curl_exec($ch);

curl_close($ch);

?>