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STATUS_NETWORK_SESSION_EXPIRED
STATUS_NETWORK_SESSION_EXPIRED identifies an expired logical SMB session, not merely a dropped TCP connection. The SMB2 specification explicitly treats an expired session as requiring the session-setup path to reauthenticate before the client can continue using remote resources.
How to narrow it down
Do not reuse old session assumptions after this status. Record the session identifier, dialect, authentication method, ticket or credential lifetime, reconnect history and whether the failure occurred in a compound request. Reauthentication can establish a new valid session, but handles, tree connections and outstanding requests must be evaluated according to the protocol and application state.
For a service, distinguish credential-expiry behavior from transient connectivity. Repeated session expiry at a fixed interval often points to an identity or session-lifetime policy, not a noisy network.
Evidence that matters
- Record session and authentication lifetime information with the status.
- Reauthenticate through the protocol instead of replaying old requests on the expired session.
- Verify state-changing operations that were pending when the session expired.
References
- Microsoft Open Specifications: NTSTATUS reference
- MS-SMB2: SMB2 SESSION_SETUP processing
- Samba: smbclient manual
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