RFC 9851: TLS 1.2 is in Feature Freeze

RFC 9851 puts TLS 1.2 into feature freeze, prohibiting any new changes except for urgent security fixes, new TLS Exporter Labels, and new ALPN Protocol IDs. This decision reflects the growing adoption of TLS 1.3, which addresses known deficiencies in TLS 1.2 including improved encryption and stronger cryptographic primitives. The freeze applies to TLS only and does not affect DTLS versions.