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When this setting is enabled, Google Chrome will use the commonName of a server certificate to match a hostname if the certificate is missing a subjectAlternativeName extension, as long as it successfully validates and chains to a locally-installed CA certificates.
Note that this is not recommended, as this may allow bypassing the nameConstraints extension that restricts the hostnames that a given certificate can be authorized for.
If this policy is not set, or is set to false, server certificates that lack a subjectAlternativeName extension containing either a DNS name or IP address will not be trusted.