cURL errors

Please contact your web host if you encounter errors like:

• cURL error 60: SSL certificate problem: unable to get local issuer certificate (see http://curl.haxx.se/libcurl/c/libcurl-errors.html):
• cURL error 60: SSL certificate problem, verify that the CA cert is OK
• cURL error 77: Problem with the SSL CA cert (path? access rights?) (see http://curl.haxx.se/libcurl/c/libcurl-errors.html):

Unfortunately, this error isn't something that can be solved by changing the plugins code as this problem is caused on server level. This problem is caused by an incorrect server configuration which isn't setting the certificates (PEM file) properly. The plugin needs those certificates to safely communicate with the Cloud API

In most cases this issue can be solved by updating the cacert.pem file on your server. If you have access to the php.ini file, also make sure that the 'openssl.cafile' setting is pointing to a cacert.pem file.

The issue can in most cases be reproduced with the following PHP script:

<?php 
// OUT-OF-THE-BOX
$url = "https://api.dropboxapi.com/2/files/list_folder";
// USE-YOUR-DRIVE
//$url = "https://www.googleapis.com/auth/drive";

$ch = curl_init(); 
curl_setopt($ch, CURLOPT_URL, $url);
curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, true); 
curl_setopt($ch, CURLOPT_SSLVERSION, 1);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true); 
curl_setopt($ch, CURLOPT_HEADER, true); 
curl_setopt($ch, CURLOPT_VERBOSE, true);

$contents = curl_exec($ch);
if($contents) { 
  echo $contents;
} else { 
  $err = curl_error($ch); 
  echo $err; 
} 

curl_close($ch);