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HTTP/2 200 date: Thu, 09 Oct 2025 02:49:51 GMT content-type: text/html; charset=UTF-8 content-encoding: gzip set-cookie: PHPSESSID=5f4nrtllo3on5oorga2erh406l; path=/ set-cookie: __cf_bm=_Lt_Po2UE5CymYRpwTXyl1Ms5_U3jGhL8cd5AOLsWbQ-1759978191-1.0.1.1-vL3QvEXxr8BRnIQj_s31Ai8q53uZYyLGSybwCamP98JCcAJPhRNIPLzGDnq8JySoxAvMhtskdiwYeFPaYyg6AVWSBZBrgWIPbWlHs8IX6cs; path=/; expires=Thu, 09-Oct-25 03:19:51 GMT; domain=.rfc-editor.org; HttpOnly; Secure; SameSite=None expires: Thu, 19 Nov 1981 08:52:00 GMT cache-control: no-store, no-cache, must-revalidate pragma: no-cache vary: Accept-Encoding strict-transport-security: max-age=31536000; includeSubDomains x-frame-options: SAMEORIGIN x-xss-protection: 1; mode=block x-content-type-options: nosniff cf-cache-status: DYNAMIC server: cloudflare cf-ray: 98ba911b78b7ea32-BLR alt-svc: h3=":443"; ma=86400 RFC Errata Report » RFC Editor

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RFC 793, "Transmission Control Protocol", September 1981

Note: This RFC has been obsoleted by RFC 9293

Note: This RFC has been updated by RFC 1122, RFC 3168, RFC 6093, RFC 6528

Source of RFC: Legacy
Area Assignment: tsv

Errata ID: 2934
Status: Held for Document Update
Type: Editorial
Publication Format(s) : TEXT
Reported By: Constantin Hagemeier
Date Reported: 2008-10-11
Held for Document Update by: Wes Eddy
Date Held: 2011-08-13

Section 3.4 says:

Reset Generation
    3.  If the connection is in a synchronized state (ESTABLISHED,
    FIN-WAIT-1, FIN-WAIT-2, CLOSE-WAIT, CLOSING, LAST-ACK, TIME-WAIT),
    any unacceptable segment (out of window sequence number or
    unacceptible acknowledgment number) must elicit only an empty
    acknowledgment segment containing the current send-sequence number
    and an acknowledgment indicating the next sequence number expected
    to be received, and the connection remains in the same state.

    If an incoming segment has a security level, or compartment, or
    precedence which does not exactly match the level, and compartment,
    and precedence requested for the connection,a reset is sent and
    connection goes to the CLOSED state. The reset takes its sequence
    number from the ACK field of the incoming segment.

It should say:

Reset Generation
    3.  If the connection is in a synchronized state (ESTABLISHED,
    FIN-WAIT-1, FIN-WAIT-2, CLOSE-WAIT, CLOSING, LAST-ACK, TIME-WAIT),
    any unacceptable segment (out of window sequence number or
    unacceptable acknowledgment number) must elicit only an empty
    acknowledgment segment containing the current send-sequence number
    and an acknowledgment indicating the next sequence number expected
    to be received, and the connection remains in the same state.

    If an incoming segment has a security level, or compartment, or
    precedence which does not exactly match the level, and compartment,
    and precedence requested for the connection, a reset is sent and
    the connection goes to the CLOSED state.  The reset takes its sequence
    number from the ACK field of the incoming segment.

Notes:

Editorial errors:
1. Typo unacceptible -> unacceptable
2. wrong spacing and missing 'the'

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RFC 793, "Transmission Control Protocol", September 1981