Error Code Portal
MicrosoftWindows Win32Error code

8643

ERROR_DS_LOW_ADLDS_FFL

Alternative forms: 0x000021C3 · 0x21C3 · ERROR_DS_LOW_ADLDS_FFL · 0x800721C3

What does this code mean?

Code 8643 · An issue reported by Windows Win32.

Official explanation · Original text

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.

Troubleshooting and diagnostic links

First check that the document's product, version, and environment match your situation.

Source and terms of use

System Error Codes (8200-8999) (WinError.h) ↗

Creator: Microsoft and MicrosoftDocs contributors
License: Creative Commons Attribution 4.0 International
Checked on: 2026-11-12

Modifications: Extracted numeric codes, symbolic names and English message text; converted Markdown/HTML to plain text and normalized whitespace; added Korean product context, namespace labels, status classification and separately labeled official links. No machine translation of message text.

Source details · Original licenses and notices