Bug ID 651886: Certain FIX messages are dropped

Last Modified: Sep 13, 2023

Affected Product(s):
BIG-IP TMOS(all modules)

Known Affected Versions:
12.1.0, 12.1.1, 12.1.2, 12.1.3,,,,,,,, 12.1.4,, 12.1.5,, 13.0.0, 13.0.0 HF1, 13.0.0 HF2, 13.0.0 HF3, 13.0.1

Fixed In:

Opened: Mar 16, 2017

Severity: 3-Major


When a FIX message is received with a length, checksum, or message type field containing leading zeros, the message may be dropped.


FIX messages from these products cannot be processed by the FIX profile in BIG-IP.


This bug affects all FIX messages having a length (tag 9), checksum (tag 10) or message type (tag 35) field that contains at least one leading zero. Certain third-party FIX protocol implementations are known to insert leading zeros in these fields.



Fix Information

Valid Financial Information eXchange protocol messages are no longer rejected

Behavior Change

Guides & references

K10134038: F5 Bug Tracker Filter Names and Tips