Same issue:
I just installed Mailchimp for WP and the status is NOT CONNECTED and MailChimp returned the following error:
Service Unavailable.
I checked my IP address and it is not blacklisted. I checked PHP CURL version
cURL support enabled, cURL Information 7.36
I have the plugin logging “everything” and the debug log has “– Nothing here. Which means there are no errors!>”
I have asked my provider to look at it and they do not see any reason that this should not be working.
My Url is https://drisidorapothecary.com
I had been having problems with MailChimp connecting for over a month and today was the day I thought I would fix it!
Thanks!