Hi. I represent the hosting operator company.
Our clients’ servers have problems with verifying domain names on your service. We tried various methods of domain verification, through dns, acme-challenge, through certbot software.
Returns an error: DNS problem: query timed out looking up A for domain.com
We have our own firewall with a lot of blocked addresses. I already read on the forum that these domain names are used for verification:
Pings from servers behind the firewall pass. Your servers have a large number of ip addresses, is it possible to find out a list of these addresses to add to our firewall?