Requests from WPTC Cron Server’s IPs need to communicate with the WPTC plugin on your dashboard.

Please whitelist the following IPs

52.33.122.174

52.27.206.180

52.25.129.179

Either by yourself or get in touch with your host to whitelist the IPs.

This is mandatory for the plugin to function.

If you are running WordFence or iThemes on your WordPress site, make sure you whitelist the IPs there too!