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Exchange 2010 running on 2012 server does not see new PDC

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Last Modified: 2015-04-07
I have a 2012 server (S1) running exchange 2010. I also had a 2008 PDC (S2) and  2012 DC (S3).  The 2008 PDC failed. I seized FSMO to the 2012 server (S3), but the exchange server (S1) does not see it. It pines for the dead 2008 server (S2).

Exchange server is not a DC. All servers are part of the same domain. The error I get on the exchange server is that an error occurred when trying to check the suitability of server 'S2'. Error 'Active directory response: The LDAP server is unavailable.

Help is needed.  Thanks.
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