I haven’t made any changes to my Hestia installation hosted by Hetzner for months now, just added an alias to an email account.
Yesterday I received this email from Hestia:
Error: Let’s Encrypt validation status 400 (mail.domain.tld). Details: 400:“During secondary validation: 195.201.XXX.XXX: Fetching https://webmail.domain.tld/.well-known/acme-challenge/8RaA3KciT6vs_TYfk3yeYjqBL3nNxecLU9WFsCwK1_4: DNS problem: networking error looking up A for webmail.domain.tld; no valid AAAA records found for webmail.domain.tld”
I then added an AAAA record for the subdomain “webmail” and now I received this one:
Error: Let’s Encrypt validation status 400 (mail.domain.tld). Details: 400:“195.201.XXX.XXX: Fetching https://webmail.domain.tld/.well-known/acme-challenge/os37TURaqnX662XGdZVPqEyPXl5ewFHlZ1AIlalSGZE: Connection refused”