Error Code Portal
MicrosoftWindows Win32Error code

8565

ERROR_DS_FOREST_VERSION_TOO_LOW

Alternative forms: 0x00002175 · 0x2175 · ERROR_DS_FOREST_VERSION_TOO_LOW · 0x80072175

What does this code mean?

Code 8565 · 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 AD DS Forest functional level or AD LDS Configuration Set functional level. You must raise the AD DS Forest functional level or AD LDS Configuration Set functional level before this server can become an AD DS Domain Controller or an AD LDS Instance in this Forest or Configuration Set.

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