Bug ID 1116813: Some of the valid connections may get rejected in HW SYN cookie mode

Last Modified: Feb 06, 2023

Bug Tracker

Affected Product:  See more info
BIG-IP TMOS(all modules)

Known Affected Versions:
13.1.0,,,,,,,,, 13.1.1,,,,, 13.1.3,,,,,,, 13.1.4,, 13.1.5,, 14.1.0,,,,,, 14.1.2,,,,,,,,, 14.1.3,, 14.1.4,,,,,,, 14.1.5,,,, 15.1.0,,,,,, 15.1.1, 15.1.2,, 15.1.3,, 15.1.4,, 15.1.5,, 15.1.6,, 15.1.7, 15.1.8,

Opened: Jun 17, 2022
Severity: 3-Major


Due to algorithm mismatch in software and hardware, valid TCP connections may get rejected with "No flow found for ACK' reset-cause while HW SYN cookie mode is active.


Service degradation.


In vCMP environment either the host or the guest is installed with an affected version.


Disable HW SYN cookie globally on the guest.

Fix Information


Behavior Change