Bug ID 717328: XLAT iRule commands do not support TCP Fast Open

Last Modified: Sep 14, 2023

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

Known Affected Versions:
14.1.0,,,,,, 14.1.2,,,,,,,,, 14.1.3,, 14.1.4,,,,,,, 14.1.5,,,,,, 15.0.0, 15.0.1,,,,

Opened: Apr 27, 2018

Severity: 3-Major


TCP::collect may not find initial data payloads in TFO connections, causing unexpected behavior during iRule execution.


Loss of connectivity on TCP Fast Open connections.


Usage of TCP::collect iRule with TCP Fast Open connections.


Disable TCP Fast Open in TCP profiles attached to ALGTK virtual servers by configuring: 'fast-open disabled'.

Fix Information


Behavior Change

Guides & references

K10134038: F5 Bug Tracker Filter Names and Tips