NTSTATUS 0xC00000A7 (STATUS_BAD_VALIDATION

Status / error code:		Category:

Constant name:
Source:		Operating System:
Description: The authentication path was asked to return an unsupported validation-information class.

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STATUS_CANT_OPEN_ANONYMOUS	STATUS_BAD_TOKEN_TYPE

STATUS_BAD_VALIDATION_CLASS

The requested logon validation format is not valid here

Authentication packages and Netlogon-style flows exchange specific validation structures describing the account, groups, session keys, and logon result. A class valid for one package, protocol version, or trusted-domain path might not be accepted by another.

Preserve the exact package name, logon type, validation class, and protocol negotiation. Do not cast the returned buffer to a preferred structure after failure. Version-gate optional classes and keep the package contract synchronized on both sides of a custom authentication integration.

What to inspect

Log authentication package, logon type, validation class, and negotiated protocol version.
Verify the class is supported by the selected package and call path.
Validate returned buffer type and length before reading any fields.

References

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