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Before issuing the Let’s Encrypt certificate, make sure that you have created a site
at the host (also available from the Internet), to which the certificate is issued, as well as that DNS settings for DNS hoster and registrator for this domain are configured correctly. Otherwise the certificate won't be issued. Plus, there is a limit – 5 errors for certificate issue per hour and per account for one domain.
Support of several sites is available, separated by comma. Certificate validity period – 90 days. Certificate re-issuing is launched automatically, approx. one month prior to its expiration.
Lets Encrypt service has limits for issuing certificates. The main ones are as follows:
- Issue of 50 certificates per week for domains (from registration for registered domains, subdomains are not included).
- If you have a lot of subdomains, all subdomains can be specified in a single certificate. However, there is a limit of 100 subdomains per single certificate.
- Five errors per 1 hour of certificate issue per account for one domain (host is unavailable, records in domain DNS are not specified and etc.).
Please, find additional details about limits of Let’s Encrypt in this Rate Limits article.