Message
Logon (A)
| ID | 11 |
| Abbr Name | Logon |
| Pedigree | Added FIX.2.7 |
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.
Field | Name | Type | Req'd | Comments | Pedigree |
|---|---|---|---|---|---|
StandardHeader | Y | MsgType = A | Added FIX.2.7 | ||
98 | Y | (Always unencrypted) | Added FIX.2.7 | ||
108 | Y | Note same value used by both sides | Added FIX.3.0 | ||
95 | Required for some authentication methods | Added FIX.2.7 | |||
96 | Required for some authentication methods | Added FIX.2.7 | |||
141 | Indicates both sides of a FIX session should reset sequence numbers | Added FIX.4.1 | |||
789 | Optional, alternative via counterparty bi-lateral agreement message gap detection and recovery approach (see "Logon Message NextExpectedMsgSeqNum Processing" section) | Added FIX.4.4 | |||
383 | Can be used to specify the maximum number of bytes supported for messages received | Added FIX.4.2 | |||
MsgTypeGrp | Added EP-1 | ||||
464 | Can be used to specify that this FIX session will be sending and receiving "test" vs. "production" messages. | Added FIX.4.3 | |||
553 | Added FIX.4.3 | ||||
554 | Note: minimal security exists without transport-level encryption. | Added FIX.4.3 | |||
925 | Specifies a new password for the FIX Logon. The new password is used for subsequent logons. | Added EP-1 | |||
1400 | Added EP-1 | ||||
1401 | Added EP-1 | ||||
1402 | Added EP-1 | ||||
1403 | Added EP-1 | ||||
1404 | Encrypted new password- encrypted via the method specified in the field EncryptedPasswordMethod(1400) | Added EP-1 | |||
1409 | Session status at time of logon. Field is intended to be used when the logon is sent as an acknowledgement from acceptor of the FIX session. | Added EP-1 | |||
1137 | Y | The default version of FIX messages used in this session. | Added EP-1 | ||
1407 | The default extension pack for FIX messages used in this session | Added EP-1 | |||
1408 | The default custom application version (dictionary) for FIX messages used in this session | Added EP-1 | |||
58 | Available to provide a response to logon when used as a logon acknowledgement from acceptor back to the logon initiator. | Added EP-1 | |||
354 | Must be set if EncodedText field is specified and must immediately precede it. | Added EP-1 | |||
355 | Encoded (non-ASCII characters) representation of the Text field in the encoded format specified via the MessageEncoding field. | Added EP-1 | |||
StandardTrailer | Y | Added FIX.2.7 |
Orchimate Copyright 2026 Atomic Wire Technology Limited
Orchestra Copyright 2026 FIX Protocol Ltd
Terms of Use|Privacy Policy