FAQ/subjectAltName (SAN)

What is subjectAltName ?

subjectAltName specifies additional subject identities, but for host names (and everything else defined for subjectAltName) :

subjectAltName must always be used (RFC 2818 4.2.1.7, 1. paragraph). CN is only evaluated if subjectAltName is not present and only for compatibility with old, non-compliant software. So if you set subjectAltName, you have to use it for all host names, email addresses, etc., not just the "additional" ones.

subjectAltName and CAcert CSR parser

The CSR parser strips any commonNames and subjectAltNames if the system can't match the domain in the system to your account, you can view domains listed on your account by going to the domains section of the website after you log in, and then clicking on View

According to the standards commonName will be ignored if you supply a subjectAltName in the certificates, verified to be working in both the latest version of MS IE and Firefox (as of 2005/05/12)...

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Further Readings


FAQ/subjectAltName (last edited 2012-09-21 18:10:17 by UlrichSchroeter)