Bug ID 700639: The default value for the syncookie threshold is not set to the correct value

Last Modified: Nov 07, 2022

Bug Tracker

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

Known Affected Versions:
12.1.0, 12.1.0 HF1, 12.1.0 HF2, 12.1.1, 12.1.1 HF1, 12.1.1 HF2, 12.1.2, 12.1.2 HF1, 12.1.2 HF2, 12.1.3,,,,,,,, 12.1.4,, 12.1.5,,,, 12.1.6

Opened: Jan 03, 2018
Severity: 3-Major


The default value for connection.syncookies.threshold should be set to 64000. Instead, this value defaults to 16384.


The connection.syncookies.threshold value will be lower than intended, possibly resulting in lower performance.


This issue may be encountered when a virtual server uses syncookies.


Use tmsh to manually set the threshold value: # tmsh modify sys db connection.syncookies.threshold value 64000

Fix Information


Behavior Change