You said ipv6 is working but how did you test it? Because http://ipv6-test.com/validate.php seems to indicate your server is not accessible by its ipv6 address on either port 80 or 443, and that would be consistent with the error message you got earlier.
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After fixing the IPv6 issue, you should be using certbot-auto
find / -name certbot-auto
Also which version of certbot are you running?
sudo certbot --version
Well, the version is in the first topic (0.19.0)…
Once again it was firewall, but some kind of weird bug with router - I need to remake firewall rules on it (so the server was good), but I tested IPv6 at monday from public net and it was ok…
So thank for your time and wish you good day
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