I am renewing certificate for domain frombaltic.ru using
However, the output is quite generic:
Error getting validation data
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 am running it on a digital ocean instance with quite an old Ubuntu installation using nginx.