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This extension can be used to match the hostname of the SSL server which is using this certificate
Declaration
Description
According to documentation:
«It is a "shell expression" that can be used to match the hostname of the
SSL server that is using this certificate. It is recommended that if the
server's hostname does not match this pattern the user be notified and given
the option to terminate the SSL connection. If this extension is not present
then the CommonName in the certificate subject's distinguished name is used for the same purpose.»