Error connecting to Mailchimp: 0 cURL error 28: Failed to connect to us17.api.mailchimp.com port 443 after 7207 ms: Couldn’t connect to server
If none of the suggested solutions form this guide work: https://www.mc4wp.com/kb/solving-connectivity-issues/
Try to manually connect from your hosting server to the MailChimp server.
First, try curl:
if that fails, do traceroute (MTR) to see where precisely on the network the connection gets refused:
In my case, the connection gets lost on some DC in Austria over which I have no control whatsoever, so all I can do is forward these MTR results to both MailChimp support and my Hosting provider.
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