> ## Documentation Index
> Fetch the complete documentation index at: https://docs.kraken.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Resend Request

> Request retransmission of messages when a sequence gap is detected

<div className="api-banner">
  <span className="api-protocol fix">FIX</span>
  <span className="api-detail">session: admin</span>
  <span className="api-tag">35=2</span>
</div>

The Resend Request message (`35=2`) is sent by either party when a sequence number gap is detected — that is, when an incoming message has a sequence number higher than expected. It requests the counterparty to retransmit all messages in the gap range.

Upon receiving a Resend Request, the counterparty should respond with either:

* The original messages with `PossDupFlag (43) = Y`, or
* A [Sequence Reset](/exchange/api-reference/unified-fix/sequence-reset) with `GapFillFlag (123) = Y` to skip messages that are no longer available (e.g. administrative messages).

***

## Fields

<ResponseField name="header" type="" required>35=`2`</ResponseField>

<ResponseField name="7 - BeginSeqNo" type="integer" required>
  First message sequence number to be retransmitted.
</ResponseField>

<ResponseField name="16 - EndSeqNo" type="integer" required>
  Last message sequence number to be retransmitted. Use `0` to request all messages from `BeginSeqNo` onwards (i.e. up to the current sequence).
</ResponseField>

<ResponseField name="trailer" type="" required />

***

## Sequence Reset — Gap Fill

When a Resend Request is received, respond with a Sequence Reset using `GapFillFlag (123) = Y` and `NewSeqNo (36)` set to the sequence number *after* the gap. This tells the server the client is skipping over the requested range rather than replaying it.

<CodeGroup>
  ```text Resend Request (server → client) theme={null}
  8=FIX.4.4|9=58|35=2|34=114|49=KRAKEN-MD|56=damien|52=20260407-20:23:52.000|7=8|16=0|10=142|
  ```

  ```text Sequence Reset GapFill (client → server) theme={null}
  8=FIX.4.4|9=57|35=4|34=8|49=damien|56=KRAKEN-MD|52=20260407-20:23:52.000|123=Y|36=14|10=088|
  ```
</CodeGroup>

<Note>
  **When to expect a Resend Request:** If your client reconnects to an existing session without resetting sequence numbers (`141=N`), or if a message is dropped in transit, the server will send a Resend Request for the missing range. Always be prepared to handle it.
</Note>