Message Logon

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 or Component	Field Name	FIXML name	Req'd	Comments	Depr.

8	BeginString		FIXT.1.1 (Always unencrypted, must be first field in message)
9	BodyLength		(Always unencrypted, must be second field in message)
35	MsgType		(Always unencrypted, must be third field in message)
1128	ApplVerID		Indicates application version using a service pack identifier. The ApplVerID applies to a specific message occurrence.
1129	CstmApplVerID		Used to support bilaterally agreed custom functionality
49	SenderCompID	@SID	(Always unencrypted)
56	TargetCompID	@TID	(Always unencrypted)
115	OnBehalfOfCompID	@OBID	Trading partner company ID used when sending messages via a third party (Can be embedded within encrypted data section.)
128	DeliverToCompID	@D2ID	Trading partner company ID used when sending messages via a third party (Can be embedded within encrypted data section.)
90	SecureDataLen		Required to identify length of encrypted section of message. (Always unencrypted)
91	SecureData		Required when message body is encrypted. Always immediately follows SecureDataLen field.
34	MsgSeqNum	@SeqNum	(Can be embedded within encrypted data section.)
50	SenderSubID	@SSub	(Can be embedded within encrypted data section.)
142	SenderLocationID	@SLoc	Sender's LocationID (i.e. geographic location and/or desk) (Can be embedded within encrypted data section.)
57	TargetSubID	@TSub	"ADMIN" reserved for administrative messages not intended for a specific user. (Can be embedded within encrypted data section.)
143	TargetLocationID	@TLoc	Trading partner LocationID (i.e. geographic location and/or desk) (Can be embedded within encrypted data section.)
116	OnBehalfOfSubID	@OBSub	Trading partner SubID used when delivering messages via a third party. (Can be embedded within encrypted data section.)
144	OnBehalfOfLocationID	@OBLoc	Trading partner LocationID (i.e. geographic location and/or desk) used when delivering messages via a third party. (Can be embedded within encrypted data section.)
129	DeliverToSubID	@D2Sub	Trading partner SubID used when delivering messages via a third party. (Can be embedded within encrypted data section.)
145	DeliverToLocationID	@D2Loc	Trading partner LocationID (i.e. geographic location and/or desk) used when delivering messages via a third party. (Can be embedded within encrypted data section.)
43	PossDupFlag	@PosDup	Always required for retransmitted messages, whether prompted by the sending system or as the result of a resend request. (Can be embedded within encrypted data section.)
97	PossResend	@PosRsnd	Required when message may be duplicate of another message sent under a different sequence number. (Can be embedded within encrypted data section.)
52	SendingTime	@Snt	(Can be embedded within encrypted data section.)
122	OrigSendingTime	@OrigSnt	Required for message resent as a result of a ResendRequest. If data is not available set to same value as SendingTime (Can be embedded within encrypted data section.)
212	XmlDataLen		Required when specifying XmlData to identify the length of a XmlData message block. (Can be embedded within encrypted data section.)
213	XmlData		Can contain a XML formatted message block (e.g. FIXML). Always immediately follows XmlDataLen field. (Can be embedded within encrypted data section.) See Volume 1: FIXML Support
347	MessageEncoding	@MsgEncd	Type of message encoding (non-ASCII characters) used in a message’s "Encoded" fields. Required if any "Encoding" fields are used.
369	LastMsgSeqNumProcessed		The last MsgSeqNum value received by the FIX engine and processed by downstream application, such as trading system or order routing system. Can be specified on every message sent. Useful for detecting a backlog with a counterparty.

Component

HopGrp

HopGrp

Number of repeating groups of historical "hop" information. Only applicable if OnBehalfOfCompID is used, however, its use is optional. Note that some market regulations or counterparties may require tracking of message hops.

end Component

628	HopCompID	@ID
629	HopSendingTime	@Snt
630	HopRefID	@Ref

98	EncryptMethod		(Always unencrypted)
108	HeartBtInt		Note same value used by both sides
95	RawDataLength	@RawDataLength	Required for some authentication methods
96	RawData	@RawData	Required for some authentication methods
141	ResetSeqNumFlag		Indicates both sides of a FIX session should reset sequence numbers
789	NextExpectedMsgSeqNum		Optional, alternative via counterparty bi-lateral agreement message gap detection and recovery approach (see "Logon Message NextExpectedMsgSeqNum Processing" section)
383	MaxMessageSize		Can be used to specify the maximum number of bytes supported for messages received

372	RefMsgType	@RefMsgTyp	Specifies a specific, supported MsgType. Required if NoMsgTypes is > 0. Should be specified from the point of view of the sender of the Logon message
385	MsgDirection		Indicates direction (send vs. receive) of a supported MsgType. Required if NoMsgTypes is > 0. Should be specified from the point of view of the sender of the Logon message
1130	RefApplVerID	@RefApplVerID	Specifies the service pack release being applied to a message at the session level. Enumerated field with values assigned at time of service pack release
1131	RefCstmApplVerID	@RefCstmApplVerID	Specifies a custom extension to a message being applied at the session level.

464	TestMessageIndicator		Can be used to specify that this FIX session will be sending and receiving "test" vs. "production" messages.
553	Username	@Username
554	Password	@Password	Note: minimal security exists without transport-level encryption.
1137	DefaultApplVerID	@DefApplVerID	The default version of FIX being carried over this FIXT session

93	SignatureLength	Required when trailer contains signature. Note: Not to be included within SecureData field
89	Signature	Note: Not to be included within SecureData field
10	CheckSum	(Always unencrypted, always last field in message)

FIX.5.0 Message

Logon [type 'A']