IPV6 Addresses for Some Domains Means Renewal Doesn't Complete


I have a little problem. I wanted to renew my certificate, but for 3 of my 7 (sub)domains, the authentication goes wrong. The server can’t connect. All those subdomains run on the same server. What could go wrong?

One of the subdomains that have a problem is:

Domain: roundcube.veelenturf.email
Type: connection
Detail: Could not connect to roundcube.veelenturf.email


Found the problem.
It was using IPv6 address when the Python script only has a webserver for IPv4.

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