---
title: SequenceReset
seo:
  title: SequenceReset | FIX Session
  description: "FIX session SequenceReset reference: field layout, repeating
    groups, supported values, and message-specific behavior."
sidebar:
  label: SequenceReset
---
`MsgType(35)=SequenceReset(4)`

Direction: **Both directions**.

Advance sequence state, including a gap fill for messages that are not replayed.

## Field Layout

See [FIX Message Layouts](/reference/fix-message-layouts) for field ordering and presence rules.

| Field | Type | Presence | Behavior |
| --- | --- | --- | --- |
| `GapFillFlag(123)` | [`BOOLEAN`](/reference/fix-data-types#boolean) | Optional |  |
| `NewSeqNo(36)` | [`SEQNUM`](/reference/fix-data-types#seqnum) | Required |  |