ERROR_DS_DRA_REF_ALREADY_EXISTS 0x80072100

Error code 8448 · HRESULT 0x80072100

WINDOWS

The replication reference information for the target server already exists.

Windows troubleshooting diagram: Device Manager warning and a system file scan
Windows errors: check drivers, system files and Event Viewer, in that order.

What it means

ERROR_DS_DRA_REF_ALREADY_EXISTS is a Windows error code (system error 8448, returned as HRESULT 0x80072100) reported by Windows. Its official message is: “The replication reference information for the target server already exists.”

How to fix ERROR_DS_DRA_REF_ALREADY_EXISTS

  1. Reboot once — many one-off system codes disappear with a clean restart
  2. Repair system files: 'sfc /scannow' then 'DISM /Online /Cleanup-Image /RestoreHealth'
  3. Find the source in Event Viewer → System: filter for this exact code and open its provider link

Related errors

ERROR_DS_DRA_REF_NOT_FOUNDERROR_DS_DRA_MAIL_PROBLEMERROR_DS_DRA_OBJ_IS_REP_SOURCEERROR_DS_DRA_OUT_OF_MEMERROR_DS_DRA_BAD_INSTANCE_TYPEERROR_DS_DRA_DB_ERRORERROR_DS_DRA_CONNECTION_FAILED

Source: Microsoft WinError.h

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