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SAN Cert SSL Hell

Posted on 2014-03-18
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Last Modified: 2014-07-15
Is it possible to take the SAN cert for exchange 2010 I got from Godaddy and push it to all our clients so Outlook doesn't keep yelling about our internal CAS array not being in the SAN cert?
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Question by:mauisun
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Expert Comment

by:Mahesh
ID: 39937027
CAS array name is not required in SAN certificate
You need to setup Split DNS so your internal Exchange hostnames are same as external hostnames
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by:mauisun
ID: 39937041
Thanks for your comment.

SAN cert says webmail.domain.org, autodiscover.domain.org.
Outlook is connecting to cas1.localdomain.org, cas2.localdomain.org

we used to have two TMGs. They're gone now. And we've applied the public cert to the cas servers.

I'm  a little lost here.
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by:Mahesh
ID: 39937076
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by:mauisun
ID: 39937210
But the SAN SSL still has to have the server name in it yes?
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Accepted Solution

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Simon Butler (Sembee) earned 500 total points
ID: 39937281
The SSL certificate does not have to have the name of the server in it, and I would go as far as to say it shouldn't do.

The CAS Array is a unique host name, used for the MAPI TCP access only. It should not be used for anything else.

Configure a split DNS system so the external name resolves internally, then use the article of mine above (also at http://semb.ee/hostnames) to configure Exchange to use the external host name internally.

That will stop the errors - no need to push anything to the clients.

Simon.
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