On 06/16/2015 09:44 PM, David Highley wrote:
> Another missed concept is the practice of using DNS CNAME aliases for a
> host, like mail.domain.com, so that things are not hardcoded all over
> the place and you can move functionality around without going to n
> places to change hardcoding. In that case the host provide is not in the
> ssl cert.

A few years back the certificate CN recommendation changed for cert generation 
from:

     'host.domain.tld'

to

     '*.domain.tld'


This was intended to allow additional flexibility. I know I've made use of that 
format for at least the last 2-3 years of certificate generation. peer 
verification in php will deal with the wildcard properly allowing the normal 
CNames for a host. (e.g. hostname, ftp, mail, www, etc..). This recommendation 
applies to both server certificates (httpd, etc.) and mail certificates.

I don't know if it will help with your setup, but it does help keep you from 
being locked into a specific cert CN.

-- 
David C. Rankin, J.D.,P.E.

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