The error code literally translates to "Replication access was denied". Common triggers include:

The host might be struggling with _msdcs zone lookups or has an incorrect primary DNS setting. Step-by-Step Fixes 1. Run with Administrative Privileges

In ADSIEdit , right-click the naming context (e.g., dc=contoso,dc=com ), go to Properties > Security , and verify the permissions. 4. Audit DNS and Network Settings

Sometimes IPv6 using a loopback address as the primary DNS can interfere. Try temporarily disabling the IPv6 stack to see if connectivity restores. 5. Reset the Machine Account Password

You might simply be running DCDIAG without administrative privileges.

If the DC has been offline longer than the or if the metadata is severely corrupted, the most reliable path may be to perform a metadata cleanup using ntdsutil , demote the server (forcibly if necessary), and re-promote it.

If you are seeing the error while running tools like DCDIAG , you've hit a classic Active Directory permissions or configuration roadblock. This error typically means a Domain Controller (DC) is trying to pull replication data but is being told "No" by its partner. Why is This Happening?

Before diving into complex AD edits, ensure you are running your diagnostic tools correctly.