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The Mysterious Case of the Expired Certificate

Without name checking, an attacker could present a valid certificate for evil.com when you think you're connecting to bank.com , and your client would accept it. Name check enforcement blocks this. certificatenamecheckfailed

“certificatenamecheckfailed — solid feature” The Mysterious Case of the Expired Certificate Without

Even if a rogue or compromised CA issues a certificate for your domain, the name check still validates the endpoint. After installing the new certificate, Emily verified that

After installing the new certificate, Emily verified that the name check was successful, and the certificate was valid. She breathed a sigh of relief, knowing that she had averted a potential disaster.

One day, while reviewing the certificate logs, Emily noticed that a critical certificate named "example.com" had failed a name check. The error message read: "Certificate Name Check Failed: The certificate's subject name does not match the requested hostname."