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0x00002175

ERROR_DS_FOREST_VERSION_TOO_LOW

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.

win32decimal 8565

Matched as: the code as given (hex)

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.

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Source: System Error Codes (8200-8999) - Win32 apps · CC BY 4.0 · wording unchanged, formatting adapted for this site · retrieved 2026-10-09