To fix these errors, please make sure that your domain name was
entered correctly and the DNS A/AAAA record(s) for that domain
contain(s) the right IP address. Additionally, please check that
your computer has a publicly routable IP address and that no
firewalls are preventing the server from communicating with the
client. If you're using the webroot plugin, you should also verify
that you are serving files from the webroot path you provided.
I cannot understand what is the problem. Maybe we are blacklisted or a new sanction list?
Good afternoon! Tell me what exactly is shown to you? What mistake? Because we checked both just like that and through VPN, and the only thing that shows is the lack of a fresh certificate. No blocking
The fact of the matter is that we used VPN to check from different companies and everything works. This confuses me the most.
Use DNS-01? I have not heard of such a method and have not seen it in the documentation
The earlier examples of not reaching your site were not failures in Let's Encrypt. They were connection failures from regular client apps trying to reach your domain. If no one can reach your domain then Let's Encrypt won't be able to either. But, as noted, your connection and cert problems seem to be fixed.
Let us know if there is something else to help with.