The Logon <A> message authenticates a user and starts a session. It must be the first message sent by any application requesting to initiate a FIX session. A message of the same type will be sent to acknowledge the logon.
| Tag | Field Name | Data Type | Req’d | Comments |
|---|---|---|---|---|
| Standard header | Y | MsgType 35=A | ||
| 98 | EncryptMethod | int | Y | Method of encryption. Valid values:0 - None / other |
| 108 | HeartBtInt | int | Y | Heartbeat interval (seconds). |
| 141 | ResetSeqNumFlag | boolean | N | Indicates that both sides of the FIX session should reset sequence numbers. Valid Values:Y - Yes, reset sequence numbersN - No (default) |
| 553 | Username | string | Y | UserId (provided during onboarding) |
| 554 | Password | string | Y | Password (provided during onboarding) |
| Standard trailer | Y |