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STATUS_NULL_LM_PASSWORD
No compatible LAN Manager password representation exists
LAN Manager password hashing is a legacy, length-limited, case-insensitive mechanism. A modern Windows password can be valid for NT authentication while being unsuitable for conversion to the old LM form. This informational status reports that the LM password value was left empty.
Do not shorten or weaken the user password to satisfy obsolete software. Identify the component still requesting LM-compatible credentials and move it to NTLMv2, Kerberos, or another supported authentication mechanism. The NT password state is separate from the absent LM representation.
What to inspect
- Identify the caller or protocol that requested an LM password value.
- Check domain and local policy that controls storage of LAN Manager hashes.
- Upgrade or isolate legacy clients instead of changing password complexity.
References
- Microsoft Open Specifications: SAM Remote Protocol
- Microsoft Open Specifications: SAM password policy
- Microsoft Open Specifications: Netlogon Remote Protocol
- Microsoft Open Specifications: NTSTATUS values
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