March 13, 2019: End-of-Life for All TLS-SNI-01 Validation Support

Let’s Encrypt allows subscribers to validate domain control using any one of a few different validation methods. For much of the time Let’s Encrypt has been operating, the options were “DNS-01”, “HTTP-01”, and “TLS-SNI-01”. We recently introduced the “TLS-ALPN-01” method. Today we are announcing that we will end all support for the TLS-SNI-01 validation method on February 13, 2019 [edit: February

[gam-22]

私のサイトもTLS-SNI-01使っていたので、対応しないとSSL証明書が更新できなくなる。