One Exchange 2013 CU6 down, all down.

We're in the process of migrating from an older Exchange 2013 CU6 (on Windows 2012) server to two other Exchange 2013 CU6 servers on Windows 2012 R2.  

The new servers have the CAS role enable, not the older one (only mailbox)  

For some reason when the older server is down, we can't access EMC.  Besides somes users that have been already moved to the new servers can't access their mailbox.  

Any idea?

Thank you
quadrumaneAsked:
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Simon Butler (Sembee)ConsultantCommented:
I would be looking at the URL configuration of all of the servers with the CAS role very carefully. Ensure that the host names, both internally and externally resolve where you expect them to be.
If the servers are in the same AD site you should be fine, but remember that Exchange will redirect you to the closes CAS role server if going cross site.

Simon.
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quadrumaneAuthor Commented:
As I said the older server that went down is not even a CAS.  The new servers are CAS.  I checked all external and internal DNS.  I checked all virtual directories.   Internally a autodiscover SRV has been added few years ago as recommanded.  But It's a SRV record I don't think it will cause this problem.  

Thanks again
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Simon Butler (Sembee)ConsultantCommented:
Is the server in question a domain controller?
There should be no dependency on a single Exchange server - the only reason I can think of is it being a domain controller.

Simon.
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quadrumaneAuthor Commented:
No it is not.  It's a mailbox server.
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Simon Butler (Sembee)ConsultantCommented:
Have you moved the system mailboxes from that server? The administrator mailbox?
If you are removing it then you should have no mailboxes on it at all.

Simon.
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quadrumaneAuthor Commented:
Ok my brain switch was apparently in the off position.  I knew the administrator account was on the old server.  I just didn't think :)

Thanks a lot !
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