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We suppose that your server is on Bluehost. If the answer is yes, you have to add some code in
file ../wp-content/plugins/wpdatatables/source/class.wdttools.php around line 147 you will  find this line of code:

curl_setopt($ch, CURLOPT_REFERER, site_url());

and after it add:

curl_setopt( $ch, CURLOPT_IPRESOLVE, CURL_IPRESOLVE_V4);

This fix should resolve the issue that is related with Bluehost. Your code should looks like below.

curl_setopt($ch, CURLOPT_URL, $url);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
curl_setopt($ch, CURLOPT_CONNECTTIMEOUT, $timeout);
curl_setopt($ch, CURLOPT_USERAGENT, $agent);
curl_setopt($ch, CURLOPT_REFERER, site_url());
curl_setopt( $ch, CURLOPT_IPRESOLVE, CURL_IPRESOLVE_V4);
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