Skip to main content

Update to Verifying TLS Server Identities with X.509 Certificates

Document Type Replaced Internet-Draft (uta WG)
Author Rich Salz
Last updated 2021-04-01
Replaces draft-rsalz-use-san
Replaced by draft-ietf-uta-rfc6125bis
Stream Internet Engineering Task Force (IETF)
Intended RFC status (None)
Expired & archived
plain text html xml htmlized pdfized bibtex
Stream WG state WG Document
Document shepherd (None)
IESG IESG state Replaced by draft-ietf-uta-rfc6125bis
Consensus boilerplate Unknown
Telechat date (None)
Responsible AD (None)
Send notices to (None)
This Internet-Draft is no longer active. A copy of the expired Internet-Draft can be found at:


In the decade since [RFC6125] was published, the subjectAlternativeName extension (SAN), as defined in [RFC5280] has become ubiquitous. This document updates [RFC6125] to specify that the fall-back techniques of using the commonName attribute to identify the service must not be used. This document also places some limitations on the use of wildcards in SAN fields. The original context of [RFC6125] using X.509 certificates for server identity with Transport Layer Security (TLS), is not changed.


Rich Salz

(Note: The e-mail addresses provided for the authors of this Internet-Draft may no longer be valid.)