Issues with Exchange 2013 owa

Erik:

To follow up, the solution of putting the same cert on all CAS members worked. I no longer have to use persistence.

The only question I have is whether it's necessary to put the DNS name of each individual CAS server in the Cert SAN name list?

What would happen if you just used the exchange service names:

DNS Name=webmail.xyz.nl DNS Name=autodiscover.xyz.nl DNS Name=imap.xyz.nl DNS Name=pop.xyz.nl

And leave off all of these?:

DNS Name=CAS-server1.xyz.nl DNS Name=CAS-server2.xyz.nl DNS Name=CAS-server3.xyz.nl DNS Name=CAS-server4.xyz.nl DNS Name=CAS-server5.xyz.nl DNS Name=CAS-server6.xyz.nl DNS Name=CAS-server7.xyz.nl DNS Name=CAS-server8.xyz.nl DNS Name=CAS-server9.xyz.nl

When does Exchange reference the CAS server name directly instead of the typical URLS that a user references when connecting to Exchange? After reviewing documentation, I'm not certain that it's required but I would like to hear feedback from Erik and anyone else who might be reading this.

thanks,

Perry