@cirowordpress tks a lot! I was stucked in this problem for almost 3 days!
@ryanhungate alright, we’re waiting for further informations.
actually i think the problem is probably the cURL version in my service host. I have tried to connect MailChimp to another WordPress sites in differents hosts, even in localhost, and it worked.
Trying to update the cURL to the latest version might work.