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ERROR_INVALID_ACE_CONDITION
the condition stored in an access-control entry is invalid.
ERROR_INVALID_ACE_CONDITION indicates this condition: A conditional ACE is present, but its expression, encoding, token stream, operand types, or overall structure cannot be parsed or evaluated according to the Windows authorization grammar.
Where the result appears
- SetNamedSecurityInfo or policy deployment using conditional SDDL.
- dynamic access control rules with user, device, or resource claims.
- security descriptor import from another tool or OS version.
- authorization code validating callback ACE contents.
What to collect
- the exact SDDL or binary conditional expression before conversion.
- ACE type, length, alignment, and surrounding ACL revision.
- claim names, value types, operators, and quoting used in the expression.
- the API stage that rejected the condition and the target OS version.
Handling and recovery
Reject the malformed descriptor without applying a partial ACL. Rebuild the condition using documented SDDL syntax or a trusted policy editor, validate it on the target Windows version, and retain the original expression in diagnostics with sensitive claim values redacted.
Common misinterpretation
Changing file permissions around the object will not repair malformed conditional syntax inside the ACE.
References
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