The logon message authenticates a user establishing a connection to a remote system. The logon message must be the first message sent by the application requesting to initiate a FIX session.
Added in protocol FIX.2.7
See in: FIX.4.0, FIX.4.1, FIX.4.2, FIX.4.3, FIX.4.4, FIX.5.0SP1, FIX.5.0SP2, FIX.5.0SP2 EP240, FIXT.1.1.
| Field or Component | Name | Description | Is Required | Added | Is Deprecated |
|---|---|---|---|---|---|
| Block | StandardHeader | MsgType = A | Y | FIX.2.7 | |
| 98 | EncryptMethod | (Always unencrypted) | Y | FIX.2.7 | |
| 108 | HeartBtInt | Note same value used by both sides | Y | FIX.3.0 | |
| 95 | RawDataLength | Required for some authentication methods | FIX.2.7 | ||
| 96 | RawData | Required for some authentication methods | FIX.2.7 | ||
| 141 | ResetSeqNumFlag | Indicates both sides of a FIX session should reset sequence numbers | FIX.4.1 | ||
| 789 | NextExpectedMsgSeqNum | Optional, alternative via counterparty bi-lateral agreement message gap detection and recovery approach (see “Logon Message NextExpectedMsgSeqNum Processing” section) | FIX.4.4 | ||
| 383 | MaxMessageSize | Can be used to specify the maximum number of bytes supported for messages received | FIX.4.2 | ||
| ImplicitBlockRepeating | MsgTypeGrp | FIX.4.4 | |||
| 464 | TestMessageIndicator | Can be used to specify that this FIX session will be sending and receiving “test” vs. “production” messages. | FIX.4.3 | ||
| 553 | Username | FIX.4.3 | |||
| 554 | Password | Note: minimal security exists without transport-level encryption. | FIX.4.3 | ||
| 1137 | DefaultApplVerID | The default version of FIX being carried over this FIXT session | Y | FIX.4.4 | |
| Block | StandardTrailer | Y | FIX.2.7 |