If the error occurs during manual replication (e.g., "Replicate Now" in AD Sites and Services), it's likely a permission gap.
Use ADSIEdit or a similar tool to check the userAccountControl attribute. A healthy DC typically has a value of . If it is a lower value like 0x288, the system isn't recognizing the server as a trusted DC. 3. Verify Replication Permissions
Right-click your Command Prompt or PowerShell and select . Dsreplicagetinfo(Pending_Ops Null) Failed Error 0X2105
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
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 the error occurs during manual replication (e
If the secure channel is broken, you can reset the DC's machine account password using Netdom.exe .
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 If it is a lower value like 0x288,
A common culprit for "access denied" is a misconfigured computer account. Run DCDIAG /TEST:MachineAccount on the affected DC.