Please see this post for background information. The last 48 hours have been a busy time for Let’s Encrypt staff. We’ve been working hard to come up with a plan for ACME TLS-SNI validation that sufficiently protects the integrity of Web PKI while minimizing problems for people and organizations using TLS-SNI validation for HTTPS deployments. We’d like to thank our community and partners for the incredibly helpful input we’ve received. We have arrived at the conclusion that we cannot generally ...