During secondary validation: No valid IP addresses found

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Hi @ajs1k

if you have that error, first step: Read

So the main Letsencrypt server can check your domain / name server, some of the second servers are blocked.

--> You have to open your firewall.

Yep, checking your domain - log.aeschi.eu - Make your website better - DNS, redirects, mixed content, certificates

You have your own name servers ns0.core.aeschi.eu.

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