Certbot unable to bind to port 80 in IPv4

[JuergenAuer]

@Naboochodonosor

Certbot only listens to port 80 (::80) on the IPv6 local address (fe80::), not on :80.

Maybe. But if you have only an A-record, not an AAAA, Letsencrypt can't check your website.

So: Only A-Record -> your port 80 must be visible.

@Naboochodonosor

Also, you’ve started a telnet connection with 82.244.57.42 on port 23 ?

No, I've checked port 80 to see, if there is an answer.

telnet yourdomain 80