Error posting to API: cURL error 6: Could not resolve host: smushpro.wpmudev.org

We get a error posting to API: cURL error 6: Could not resolve host: smushpro.wpmudev.org any time we try to Smush the images on our site through WP Smush Pro plugin.

Others had this problem but they were resolved from quite a while back. We manually updated the plugin and new get this error when performing any "smush".