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0x00002173

ERROR_DS_FOREST_VERSION_TOO_HIGH

The version of the operating system is incompatible with the current AD DS forest functional level or AD LDS Configuration Set functional level.

win32decimal 8563

Matched as: the code as given (hex)

The version of the operating system is incompatible with the current AD DS forest functional level or AD LDS Configuration Set functional level. You must upgrade to a new version of the operating system before this server can become an AD DS Domain Controller or add an AD LDS Instance in this AD DS Forest or AD LDS 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