Error Code Portal
MicrosoftWindows Win32Error code

8566

ERROR_DS_DOMAIN_VERSION_TOO_LOW

Alternative forms: 0x00002176 · 0x2176 · ERROR_DS_DOMAIN_VERSION_TOO_LOW · 0x80072176

What does this code mean?

Code 8566 · An issue reported by Windows Win32.

Official explanation · Original text

The version of the operating system installed on this server no longer supports the current domain functional level. You must raise the domain functional level before this server can become a domain controller in this domain.

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