Start the Identity Synchronization for Windows management console.
Select the Configuration tab. Expand the Directory Sources node.
Select the appropriate Active Directory Source.
Click Edit controller, and then select the new domain controller.
Make the selected domain controller the NT PDC FSMO role owner of the domain
Save the configuration.
Stop the Identity Synchronization service on the host where the Active Directory Connector is running.
Delete all the files except the directories, under ServerRoot/isw-hostname/persist/ADPxxx. Here, xxx is the number portion of the Active Directory Connector identifier.
For example, 100 if the Active Directory Connector identifier is CNN100.
Start the Identity Synchronization service on the host where the Active Directory Connector is running.
Follow the steps according to your synchronization flow in the unidirectional or the bidirectional synchronization sections.