Hey,
I have setup Pro on one of my servers and added Convertplug and the Mailchimp Addon. I have created a new list and an API key according to this guide: https://www.convertplug.com/plus/docs/mailchimp-wordpress-popup-plugin/
When I try to create a new connection I get a cURL error in the connector. Please see screenshot:

I’m on the latest version of Pro and not using https. Can’t think of anything else. Could you please have a look?
Thanks,