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ERROR_BAD_VALIDATION_CLASS
The security subsystem received a validation-information class that does not match the requested authentication operation
Windows authentication packages and Netlogon exchange typed logon and validation structures. The chosen information class determines which structure, fields, and validation result the receiver expects. A bad validation class is therefore a protocol/API contract mismatch: the class selector is invalid for the operation, version, or logon level, rather than an ordinary credential rejection.
Record the logon level, validation level/class, authentication package, and structure version at the failing boundary. For Netlogon paths, the protocol specification restricts which validation levels can accompany particular logon levels. For custom authentication code, verify that the buffer layout and package-specific message type correspond to the class value. Retrying with another password will not fix a mismatched selector; compare the caller and receiver contract and check for mixed header/SDK or protocol-version assumptions.
What to inspect
- Capture the exact logon level and validation information class.
- Verify the buffer structure/version associated with that class.
- Check for a caller/receiver version mismatch before testing credentials again.
References
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