Door Anoniem: February 13, 2019: End-of-Life for All TLS-SNI-01 Validation Support API Announcements josh ISRG Executive Director Oct '18 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. In January of 2018 we disabled the TLS-SNI-01 domain validation method for most subscribers due to a vulnerability enabled by some shared hosting infrastructure 64. We provided temporary exceptions for renewals and for a small handful of hosting providers in order to smooth the transition to DNS-01 and HTTP-01 validation methods. Most subscribers are now using DNS-01 or HTTP-01. If you're still using TLS-SNI-01, please switch to one of the other validation methods as soon as ...