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Page Revision: 2012/11/06 09:39

Session Initiation

After a successful SSL connection, the T4 FIX API basic requirement is to have both the Initiator and Acceptor start with sequence number 1. The client will initiate the FIX Session by sending a Logon Message to the T4 FIX API server. Successful authentication will be responded with a Logon message echo. The Password field (Password - Tag 554) of the API server logon message will be identified with an asterisk.

Drop of a physical connection will result in the end of a FIX Session. Upon reconnection, the client is required to start a new FIX Session with sequence number 1. The T4 API server will appropriately respond with messages starting with sequence number 1.

Authentication Requirements

After a successful physical connection to the T4 FIX API server, authenticated access is achieved with the following T4 input parameters in the client's Logon message:

Tag Name	Tag Number	Description
TargetCompId	56	T4 Firm
SenderCompId	49	T4 Application Name
SecureData	91	License Code for the T4 Application
SecureDataLen	90	Length of License Code string
UserName	553	T4 User
Password	554	T4 Password

Failure to provide the correct parameters in the Logon message will result in an logon failure. Appropriately, a Logout message will be sent to the client. The Logout message will contain a short description of the failure to help determine the cause of failed authentication. Thereafter, a physical disconnection will occur. As the FIX Session failed, the T4 FIX API will expect a new attempt for a new FIX session. The next Logon message (from the client) must start with sequence number 1.

Message Dictionary

Tag	Field Name	Req'd	Comments
	Standard Header	Y	MsgType = A
91	SecureData	Y	License Code for the T4 Application
90	SecureDataLen	Y	Length of License Code string
49	SenderCompID	Y	T4 Application Name
56	TargetCompID	Y	T4 Firm
553	UserName	Y	T4 User
554	Password	Y	T4 Password
	Body	Y
98	EncryptMethod	Y	Value = None. Always Unencrypted.
108	HeartBtInt	Y	Heartbeat interval. Set to 30 seconds.
	Standard Trailer	Y

Sample Message

>> 11/5/2012 5:50:55 PM   [FIXLOGIN] 34=1|49=T4Example|56=T4|52=20121105-23:50:55.492|91=64768859-3ACF-4224-A4E9-DA66901AFC63|90=36|98=None|108=30|553=_tradername_|554=_password_|
[FIXLOGIN]
[MsgSeqNum] 34 = 1
[SenderCompID] 49 = T4Example
[TargetCompID] 56 = T4
[SendingTime] 52 = 20121105-23:50:55.492
[SecureData] 91 = 64768859-3ACF-4224-A4E9-DA66901AFC63
[SecureDataLen] 90 = 36
[EncryptMethod] 98 = None
[HeartBtInt] 108 = 30
[UserName] 553 = _tradername_
[Password] 554 = _password_

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