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ERROR_LOCAL_USER_SESSION_KEY
A legacy authentication flow did not produce a user-specific session key
This status belongs to older Windows authentication and network-logon key handling, not to the modern concept of an access-token AuthenticationId. Netlogon validation structures can carry a UserSessionKey, while NTLM derives session key material from the authenticated credential exchange. A path that reports this result is telling the caller that no user-specific encryption key was available and that a known fallback key was returned.
Treat the result as a protocol/authentication-context clue rather than a generic cryptographic API failure. Identify which authentication package and logon level were used, whether the operation was local or passed through Netlogon, and whether the session was anonymous or guest-like. Do not reuse the returned value as proof of a normal authenticated session key. Capture the package status and protocol negotiation because NTLM session-key derivation and Netlogon UserSessionKey transport have explicit conditions and differ from Kerberos ticket keys.
What to inspect
- Identify the authentication package and the exact logon/validation level.
- Check whether the session was anonymous, guest, or otherwise lacked user key material.
- Do not confuse UserSessionKey protocol data with the LUID that identifies a logon session.
References
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