ERROR_DS_LOW_ADLDS_FFL 0x800721C3

Error code 8643 · HRESULT 0x800721C3

WINDOWS

The functional level of the AD LDS configuration set cannot be raised to the requested value, because there exist one or more ADLDS instances that are at a lower incompatible functional level.

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_LOW_ADLDS_FFL is a Windows error code (system error 8643, returned as HRESULT 0x800721C3) reported by Windows. Its official message is: “The functional level of the AD LDS configuration set cannot be raised to the requested value, because there exist one or more ADLDS instances that are at a lower incompatible functional level.”

How to fix ERROR_DS_LOW_ADLDS_FFL

  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_LOW_DSA_VERSIONERROR_DS_HIGH_DSA_VERSIONERROR_DS_HIGH_ADLDS_FFLERROR_DS_UNDELETE_SAM_VALIDATION_FAILEDERROR_DOMAIN_SID_SAME_AS_LOCAL_WORKSTATIONERROR_DS_DISALLOWED_NC_REDIRECTERROR_INCORRECT_ACCOUNT_TYPE

Source: Microsoft WinError.h

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