The final piece! Wildcard certificate within Exchange 2010

First off...THANK YOU FOR YOUR HELP THUS FAR - YOU ARE ALL AMAZING! :D

I'm in the final stage of my new Exchange, load balanced and clustered environment. I was doing a "testexchangeconnectivity.com" check and found my new Exchange setup was failing on "Testing SSL mutual authentication with the RPC proxy server." It was attempting to use the cert for my production Exchange environment (EMAIL.domain.com) instead of the new cert (MAIL.domain.com). The actual error was:

The certificate common name email.domain.com doesn't validate against the mutual authentication string that was provided: msstd:mail.domain.com

I did some digging and found I needed to run a quick command to fix this:

set-outlookprovider  EXPR -CertPrincipalName msstd:mail.domain.com

And, at moment, everything within my new Exchange environment began to work beautifully! But, my  joy was short lived...

I found that after switching the outlook provider cert to mail.domain.com (from email.domain.com), my clients in the production environment started getting a nasty error:

 
There is a problem with the proxy server’s security certificate. The name on the security certificate is invalid or does not match the name of the target site mail.domain.com. Outlook is unable to conned to the proxy server. (Error Code 0)

Scary! D:

I immediately switched the outlook provider cert back. I need to know... Can I simply get a wildcard certificate and use that for both my mail.domain.com and email.domain.com? For example, running this command:

set-outlookprovider  EXPR -CertPrincipalName msstd:*.domain.com

How would I do this?

Thank you!!
LVL 3
jmichaelpalermo4Asked:
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AkhaterConnect With a Mentor Commented:
If you are planning to use a wildcard certificate then yes you have to run
set-outlookprovider  EXPR -CertPrincipalName msstd:*.domain.com


that being said you shouldn't have such issues, the second error was most probably due to the fact that you changed the certificate on your exchange but didn't do the needed changes in tyour excchange urls
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Simon Butler (Sembee)ConsultantCommented:
If you are going to use a wildcard certificate instead of a UC (aka multiple domain) certificate then that is the command that you need to run.

Simon.
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jmichaelpalermo4Author Commented:
Is it as simple as that? Are there drawbacks to doing it this way? Is there a way to successfully use both mail.domain.com and email.domain.com without going the wildcard route?

J
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AkhaterCommented:
yes you can buy a UCC (SAN) certificate and add both URI to it that's the common way of doing it
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jmichaelpalermo4Author Commented:
Well, there's also another side I haven't mentioned. Currently, in production, I use a single Exchange server with CAS, HUB, and MBX, roles. When I created the CAS Array in my development domain, my production server joined the Array. When I set the URLs for each of my services ECP, OWA, Active Sync, OAB, etc. I only did it for the CAS servers in my test environment. Leaving the production server using the email.domain.com URL.

Would having a CAS server within an Array cause problems if it was using different URLs than the other Exchange servers?

J
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AkhaterCommented:
cas array is only used for RPC connectivity it has nothing to do with the exchange URLs or the the certificate
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jmichaelpalermo4Author Commented:
Do I just create a certificate for *.domain.com or add alternative DNS names to the certificate, or both?
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AkhaterCommented:
You can't do both you need to decide on one route or another both would work
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