troubleshooting Question

Outlook not connecting to CAS array Exchange 2010

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southwestsixteenFlag for United Kingdom of Great Britain and Northern Ireland asked on
ExchangeOutlookEmail Servers
5 Comments1 Solution639 ViewsLast Modified:
Hi,

A couple of years ago we set up an Exchange 2010 environment with 2 client access servers in a cas array. Everything has been ok until our self signed SAN certificate expired. Microsoft assisted us with the CAS array setup so I followed the same instruction the tech used first time around (see below):

-Checked Certificate on both the CAS servers named CAS01 & CAS02, found different self signed certificate installed.
-So to create new certificate, we Installed Certificate services on DC01 Domain Controller.
-Ran below command in Exchange management shell to create certificate request file
Set-Content -path ".\exchange_domain_org_uk.txt" -Value (New-ExchangeCertificate -GenerateRequest -KeySize 2048 -SubjectName "c=GB, s=London, l=London,  o=Company, ou=IT, cn=exchange.domain.org.uk" -DomainName CAS01, CAS01.domain.org.uk, CAS02, CAS02.domain.org.uk, CASARRAY, CASARRAY.domain.ORG.UK,  Autodiscover.domain.org.uk, Autodiscover.domain2.org.uk, exchange.domain.org.uk -PrivateKeyExportable $True)
-Created new private UCC certificate as per below,
Issued to: exchange.domain.org.uk
Issued by: domain.org.uk

SAN
------
CAS01
CAS01.domain.org.uk
CAS02
CAS02.domain.org.uk
CASARRAY
CASARRAY.domain.ORG.UK
Autodiscover.domain.org.uk
Autodiscover.domain2.org.uk

After doing this we still had issues where the Outlook clients were using the expired certificate so they were getting warning popups when they started Outlook so I removed the old certs.

Now when you start Outlook it won't open at all and says Exchange is unavailable. I've done a workaround where I amended the DNS record for CASARRAY from its cluster IP to the IP of one of the individual cas servers and users are at least able to connect but I seriously need help in figuring out what went wrong with the CAS array?

Any help would be much appreciated? Thanks.
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