ERROR_DS_HIGH_ADLDS_FFL 0x800721C1

Error code 8641 · HRESULT 0x800721C1

WINDOWS

The functional level of the AD LDS configuration set cannot be lowered to the requested value.

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_HIGH_ADLDS_FFL is a Windows error code (system error 8641, returned as HRESULT 0x800721C1) reported by Windows. Its official message is: “The functional level of the AD LDS configuration set cannot be lowered to the requested value.”

How to fix ERROR_DS_HIGH_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_HIGH_DSA_VERSIONERROR_DS_DISALLOWED_NC_REDIRECTERROR_DS_DRA_RECYCLED_TARGETERROR_DS_LOW_ADLDS_FFLERROR_DS_OID_NOT_FOUNDERROR_DOMAIN_SID_SAME_AS_LOCAL_WORKSTATIONERROR_DS_OID_MAPPED_GROUP_CANT_HAVE_MEMBERS

Source: Microsoft WinError.h

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