sbsartis.b2m-it.com has an A (IPv4) record (197.13.22.2) but a request to this address over port 80 did not succeed. Your web server must have at least one working IPv4 or IPv6 address.
A timeout was experienced while communicating with sbsartis.b2m-it.com/197.13.22.2: Get "http://sbsartis.b2m-it.com/.well-known/acme-challenge/letsdebug-test": dial tcp 197.13.22.2:80: i/o timeout
Trace:
@0ms: Making a request to http://sbsartis.b2m-it.com/.well-known/acme-challenge/letsdebug-test (using initial IP 197.13.22.2)
@0ms: Dialing 197.13.22.2
@10000ms: Experienced error: dial tcp 197.13.22.2:80: i/o timeout
A test authorization for sbsartis.b2m-it.com to the Let's Encrypt staging service has revealed issues that may prevent any certificate for this domain being issued.
197.13.22.2: Fetching http://sbsartis.b2m-it.com/.well-known/acme-challenge/34CQz6nWYCROLfR1BzNYKCUgKqAhray-BYdZCnEBItk: Timeout during connect (likely firewall problem)