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How to Fix RPC Error 8453: Active Directory Replication Access Denied
Question details
Azure AD Connect password hash synchronization fails with a replication access denied error.
- Product
- Active Directory / Azure AD Connect
- Device & OS
- not provided
- Scenario
- Attempting to synchronize password hashes for a child domain using Azure AD Connect.
- Observed behavior
- The synchronization process fails, throwing Microsoft.Online.PasswordSynchronization.DirectoryReplicationServices.DrsException alongside RPC Error 8453, indicating that Active Directory replication access was denied.
Ensure you are logged in to the domain controller with Domain Admin or Enterprise Admin credentials, as modifying directory partition security settings requires elevated privileges.
Grant Required Replicating Directory Changes Permissions
Resolve the replication access denied error by manually assigning the correct directory replication permissions to the Azure AD Connect synchronization account.
RPC Error 8453 occurs when the affected domain controller lacks the necessary replication permissions for the Azure AD Connect (MSOL) account. Correcting these permissions in the Active Directory security settings restores synchronization functionality.
Log in to your Domain Controller, open the Start menu, and launch the Active Directory Users and Computers (ADUC) snap-in.
Click on the 'View' menu at the top of the ADUC console and select 'Advanced Features' to ensure the Security tab becomes visible.
Right-click the domain or specific directory partition that is failing to synchronize, and select 'Properties' from the context menu.
Navigate to the 'Security' tab. Locate the Azure AD Connect synchronization account (often starting with MSOL_). Check the Allow box for both 'Replicating Directory Changes' and 'Replicating Directory Changes All', then click Apply and OK.
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Frequently Asked Questions
What causes RPC Error 8453 during Azure AD Connect synchronization?
This error is triggered when the Azure AD Connect synchronization account (usually the MSOL account) does not have sufficient permissions to replicate directory changes from the on-premises Active Directory.
Which specific permissions are needed to fix DirectoryReplicationServices.DrsException?
The synchronization account must be granted 'Allow' access for two specific permissions: 'Replicating Directory Changes' and 'Replicating Directory Changes All' on the affected domain or directory partition.
How do I force a password hash synchronization after fixing the permissions?
You can trigger a manual synchronization by opening PowerShell as an Administrator on your Azure AD Connect server and executing the command: Start-ADSyncSyncCycle -PolicyType Delta.
