SFNA / EFNA

OFTP2 file-level negative acknowledgements, RFC 5024.

Definition

SFNA is the Listener's negative reply to an SFID (e.g. unknown dataset, file already received, restart impossible); EFNA is the negative reply to an EFID (e.g. write error, inconsistent record count). Each carries a reason code and a retry indicator. Distinct from NERP, the deferred application-level refusal.

Origin

Defined in RFC 5024 §5.3 and the reason-code annex (ODETTE File Transfer Protocol 2), maintained by Odette International.

Example in context

SFID dataset=UNKNOWN → SFNA reason=13 (file already exists) retry=N

Related terms

• SFID — the command an SFNA refuses.
• EFID / ESID — the closure an EFNA rejects.