ZagTrader

FIX Protocol Tag 553: Username

User name used for authentication, for example in a Logon or User Request.

Tag number
553
Data type
STRING
FIX versions
FIX 4.3 to 5.0 SP2 and FIXT 1.1
Used in
4 message types

Practical notes on Username

Username on the Logon, used by counterparties that authenticate sessions with a user name and password.

  • It is sent with Password (554). Many venues rely on CompIDs and source IP instead and ignore both fields.

Changes between FIX versions

  • Username (553) and Password (554) are in the Logon from FIX 4.3. Earlier sessions used counterparty-specific fields for credentials.

See also:Logon rejected

Tag 553 in each FIX version

Values and message usage as defined in a specific version.

Data type

STRING: Text of printable characters. It cannot contain the SOH delimiter.

Example

553=trader01

Illustrative value. In a message, fields are separated by the SOH character (0x01), often shown as | or ^ in logs.

Decode a message with this tag

Message types that use tag 553

Covers every version from FIX 4.0 to 5.0 SP2, including fields reached through components and repeating groups. The version pages above show whether the tag is required in each 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.