Article 2

To get a single domain controller out of USN Rollback:
Open Regedit
Navigate to HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\NTDS\Parameters
Locate the key “Dsa Not Writable”=dword:00000004
Delete the entire key
Enable replication by running repadmin /options servername -DISABLE_OUTBOUND_REPL and repadmin /options servername -DISABLE_INBOUND_REPL
RebootOnce your domain controller has rebooted you should find that NetLogon is running again and repadmin /options no longer shows replication as being disabled.