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Seeing security certificate errors when visiting certain websites? Learn how to remedy this issue in Internet Explorer.
An expansion of the 400 Bad Request response code, used when the client has provided an invalid client certificate. 496 SSL Certificate Required An expansion of the 400 Bad Request response code, used when a client certificate is required but not provided.
437 Unsupported Certificate The server was unable to validate a certificate for the domain that signed the request. [14]: p11 438 Invalid Identity Header The server obtained a valid certificate that the request claimed was used to sign the request, but was unable to verify that signature. [14]: p12 439 First Hop Lacks Outbound Support
The MustStaple TLS extension in a certificate can require that the certificate be verified by a stapled OCSP response, mitigating this problem. [10] OCSP also remains a valid defense against situations where the attacker is not a "man-in-the-middle" (code-signing or certificates issued in error).
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The Basic Status Codes have been in SMTP from the beginning, with RFC 821 in 1982, but were extended rather extensively, and haphazardly so that by 2003 RFC 3463 rather grumpily noted that: "SMTP suffers some scars from history, most notably the unfortunate damage to the reply code extension mechanism by uncontrolled use.
HTTP Public Key Pinning, announces hash of website's authentic TLS certificate: Public-Key-Pins: max-age=2592000; pin-sha256="E9CZ9INDbd+2eRQozYqqbQ2yXLVKB9+xcprMF+44U1g="; Permanent RFC 7469: Retry-After: If an entity is temporarily unavailable, this instructs the client to try again later.
The Certificate Management Protocol (CMP) is an Internet protocol standardized by the IETF used for obtaining X.509 digital certificates in a public key infrastructure (PKI). CMP is a very feature-rich and flexible protocol, supporting many types of cryptography.