FIX 5.0 SP1 Logon (35=A)

First message of a FIX session. The initiator sends it to authenticate and to set session parameters such as HeartBtInt (108) and EncryptMethod (98); the acceptor replies with its own Logon.

MsgType (tag 35): A
Name in FIX 5.0 SP1: Logon
Category: Session (administrative)
Required body fields: 3

Fields in FIX 5.0 SP1

Body fields in the order the FIX 5.0 SP1 definition lists them. A repeating group starts with its counter field (NoXxx), followed by the fields of each entry, indented. A field inside an optional component or group is required only when that component or group is present.

Tag	Field	Required
98	EncryptMethod	Required
108	HeartBtInt	Required
95	RawDataLength	Optional
96	RawData	Optional
141	ResetSeqNumFlag	Optional
789	NextExpectedMsgSeqNum	Optional
383	MaxMessageSize	Optional
	Component MsgTypeGrp	Optional
384	NoMsgTypes (repeating group)	Optional
372	RefMsgType	Optional
385	MsgDirection	Optional
1130	RefApplVerID	Optional
1406	RefApplExtID	Optional
1131	RefCstmApplVerID	Optional
1410	DefaultVerIndicator	Optional
464	TestMessageIndicator	Optional
553	Username	Optional
554	Password	Optional
925	NewPassword	Optional
1400	EncryptedPasswordMethod	Optional
1401	EncryptedPasswordLen	Optional
1402	EncryptedPassword	Optional
1403	EncryptedNewPasswordLen	Optional
1404	EncryptedNewPassword	Optional
1409	SessionStatus	Optional
1137	DefaultApplVerID	Required
1407	DefaultApplExtID	Optional
1408	DefaultCstmApplVerID	Optional
58	Text	Optional
354	EncodedTextLen	Optional
355	EncodedText	Optional

Every message also carries the FIX 5.0 SP1 standard header (BeginString, BodyLength, MsgType, SenderCompID, TargetCompID, MsgSeqNum, SendingTime and others) and ends with CheckSum (10).

Also in other versions

Logon across all FIX versions

Decode a Logon message

Field and message data comes from the QuickFIX data dictionaries for FIX 4.0 to 5.0 SP2 and FIXT 1.1, used under the QuickFIX Software License. This product includes software developed by quickfixengine.org (http://www.quickfixengine.org/). Enumerated value names are converted to plain text for reading.