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Exchange 2013/2007 coexistence: The Name on the Security Certificate is Invalid or Does Not Match the Name of the Site.

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In the midst of Exchange 2013/2007 coexistence configuration. 

Currently:

Exchange 2007:

2 CAS\HUB

1 Mailbox server

Exchange 2013 (2 sites):

LA:

1 CAS

2 MBX servers

MKE:

1 CAS 

2 MBX servers.

We purchased a certificate from Digicert and added every SAN name we could think of including "legacy.companyname.com", just to be sure. Added certificate to Exchange 2013 CAS servers and 2007 CAS\HUB boxes. Configured virtual directories on Exchange 2013 MKE-CAS01 but not on Exchange 2013 LA-CAS01. Configured virtual directories to on Exchange 2007 CAS\HUB to point to "legacy.companyname.com". 

Mailboxes have not been moved yet. I just wanted to get the coexistence between Exchange 2013/2007 up first but some users (not all) receiving"The name of the security certificate is invalid or does not match the name of the site" for"LEGACY.COMPANYNAME.COM". I remember configuring the AUTODISCOVER virtual directory for Exchange 2007. Any ideas? Thank you.


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