I’m trying to renew a certificate, for aagl903w.fbxos.fr but the validation fails. The failure is related to the fact that Let’s encrypt prefers IPv6 against IPv4 when both records are present.
The domain has indeed an AAAA record, but the corresponding IPv6 address is not reachable. In fact, my connection doesn’t have any IPv6 support.
For example, running curl -v6 http://aagl903w.fbxos.fr
Immediate connect fail for 2a01:e35:87fa:8220::1: Network is unreachable
I suppose that it is a configuration error but unfortunately the DNS configuration is completely out of my control being fully managed by the ISP.
Is it possible to force an IPv4 validation. Or another alternative? It is not supposed to fallback on IPv4 in case of routing problems?