RFC 2818 sagt:
If a subjectAltName extension of type dNSName is present, that MUST be used as the identity. Otherwise, the (most specific) Common Name field in the Subject field of the certificate MUST be used. Although the use of the Common Name is existing practice, it is deprecated and Certification Authorities are encouraged to use the dNSName instead.
Das bedeutet, dass der CN ignoriert wird, wenn subjectAltName vorhanden ist. Daher müssen Sie foobox.grawity.tld als subjectAltName-Eintrag hinzufügen.