But, the AD Replication error 8453 still appeared.
The error log in Windows Event Viewer doesn't help much. Below is the error message:
The management agent "ADMA" failed on run profile "FullImport" because of connectivity issues.
The management agent "ADMA" failed on run profile "FullImport" because a partition specified in the configuration could not be located.
The DCDIAG Replication test (DCDIAG /TEST:NCSecDesc) reports that everything is OK.
So, what is wrong?
That can be done through "adsiedit.msc".