[openssl-users] Subject CN and SANs

Walter H. Walter.H at mathemainzel.info
Sun Dec 23 09:24:55 UTC 2018

On 23.12.2018 03:47, Salz, Rich via openssl-users wrote:
>     >  >. New certificates should only use the subjectAltName extension.
>>     Are any CAs actually doing that? I thought they all still included subject.CN.
> Yes, I think commercial CA's still do it.  But that doesn't make my statement wrong :)
Apache raises a warning at the following condition

e.g. a virtual Host defines this:

ServerName  www.example.com:443

and the SSL certificate has a CN which does not correspond to
CN=www.example.com, e.g.  CN=example.com

then the warning looks like this

[Fri Dec 07 07:08:19.393876 2018] [ssl:warn] [pid 29746] AH01909: 
www.example.com:443:0 server certificate does NOT include an ID which 
matches the server name

and fills up the logs


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