Hi,
Error 1864 means there may be a replication error between DCs. To help you better, I suggest you refer to the following link:
Error Event ID 1864 NTDS Replication
http://social.technet.microsoft.com/Forums/windowsserver/en-US/ccae98d9-75cb-4988-8a1a-535b3e1bfeac/error-event-id-1864-ntds-replication
Event ID: 1864 Active Directory Domain Service Replication Error
http://social.technet.microsoft.com/Forums/windowsserver/en-US/5ee08d4f-7ae6-4919-b0d6-4c912339d4b4/event-id-1864-activedirectorydomainservice-replication-error
Troubleshooting Active Directory Replication Problems
http://technet.microsoft.com/zh-cn/library/cc949120(v=ws.10).aspx
If these links don't help you, I suggest you post your issue on Windows
Server Directory Services forum to help you better.
This is the forum link:
https://social.technet.microsoft.com/Forums/windowsserver/en-US/home?forum=winserverDS
Best regards,
Hollis Huang
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