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makiwa1

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NTDS KCC schema mismatch

I demoted a DC and am now getting the following message in event viewer.
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The attempt to establish a replication link with parameters
 
 Partition: CN=Configuration,DC=cardiff,DC=DOMAIN,DC=com
 Source DSA DN: CN=NTDS Settings,CN=BR-PTPEH-DC3,CN=Servers,CN=Embassy-house,CN=Sites,CN=Configuration,DC=cardiff,DC=DOMAIN,DC=com
 Source DSA Address: 4e2e72d0-54b5-4fbd-bbfd-315f2b669b7c._msdcs.cardiff.DOMAIN.com
 Inter-site Transport (if any): CN=IP,CN=Inter-Site Transports,CN=Sites,CN=Configuration,DC=cardiff,DC=DOMAIN,DC=com
 
 failed with the following status:
 
 The replication operation failed because of a schema mismatch between the servers involved.

 The record data is the status code.  This operation will be retried.
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I had 2 DCs in one site and another DC at a remote site. At the end of the DCPROMO process I did get an FRS error. It looks as though the remote site does not know about this change. I do have connectivity between the sites.
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