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This topic contains the message specification for the Logon (tag 35-MsgType=A) message sent from the Client System to CME Globex initiates the session logon.

Possible CME Globex response messages: Logon (tag 35-MsgType=A), Logout (tag 35-MsgType=5), or Session Level Reject (tag 35-MsgType=3).

Tag

Name

Enumeration

Req

Description

Standard Header - Client System to CME Globex






35MsgTypeString(2)A=LogonYHeader tag identifying message type.

108

HeartBtlnt

Int(3)

30-60 inclusive

Y

Hearbeat interval in seconds.

  • CME Group requires a heartbeat interval between 5 and 60 seconds. Intervals of less than 5 seconds are not permitted. Intervals longer than 60 seconds are not supported. The recommended value is 30 (seconds).
  • CME Globex uses the heartbeat interval submitted in the customer Logon message.

141

ResetSeqNumFlag

Boolean(1)

Y=Yes, reset sequence numbers

N=No

C

Indicates that both sides of the FIX session should reset sequence numbers.

For beginning of week and mid-week logon, tag 141 is optional but a Logon message with 141=Y will receive a Logout message in response. During in-session logon, tag 141 is required and must be set to "Y". 

Messages with incorrect or missing tag 141 values will result in session logout.

1603

ApplicationSystemName

String(30)

Value obtained from GAM or ISV.

Y*

Identifies system generating the message.

1604

TradingSystemVersion

String(10)

Value obtained from GAM or ISV.

Y*

Identifies the version of the system generating the message.

1605

ApplicationSystemVendor

String(10)

Value obtained from GAM or ISV.

Y*

Identifies the vendor of the application system.

354

EncodedTextLen

Length(2)


C

Length of the Access Key ID.

Must be sent if tag 355-EncodedText field is specified and must immediately precede it.

355

EncodedText

Data(32)


C

Contains the Access Key ID assigned to the session ID in tag 49-SenderCompID.

1400

EncryptedPasswordMethod

String(13)

CME-1-SHA-256

C

Defines the method used to create secure cryptographic hash in the encrypted password field.

For day 1 the only valid value supported is CME-SHA-256 which represents first CME version of message digest or hash of SHA-256.

1401

EncryptedPasswordLen

Length(2)


C

Length of tag 1402-EncryptedPassword which contains the HMAC signature.

1402

EncryptedPassword

Data(44)


C

Contains the HMAC signature built with HMAC data using the instruction provided.

Standard Message Trailer





End of message.

Y: Required by FIX protocol, Y*: Required by CME Globex (not by FIX protocol), N: Not Required, C: Conditionally

See Session Layer Validation Rejects for a list of error messages for tag 58-Text for the Logon message.