Check the following information:
1. Replication is controlled by the Options attribute on the NTDS Settings object as shown in the following table. The Options attribute value is found in ADSI Edit by browsing to Configuration → Sites → <Site Name> → Servers – <Server Name> → NTDS Settings.
2. Check the default UserAccountControl values for domain controller in ADSI Edit (Default naming context->DC=mydomain,DC=domain->OU=Domain Controllers->right-click the name of DC).
Domain controller : 0x82000 (532480)
Typical setting for a DC is 0x82000 = ( UF_SERVER_TRUST_ACCOUNT | UF_TRUSTED_FOR_DELEGATION ).