Bug ID 953425: Hardware syncookie mode not cleared when changing dos-device-vector enforcement

Last Modified: Oct 21, 2020

Bug Tracker

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

Known Affected Versions:
13.1.0,,,,,,,,, 13.1.1,,,,, 13.1.3,,,,, 14.0.0,,,,,, 14.0.1,, 14.1.0,,,,,, 14.1.2,,,,,,,,, 15.0.0, 15.0.1,,,,, 15.1.0,,,,,, 15.1.1, 16.0.0,

Opened: Oct 08, 2020
Severity: 3-Major


Changing DOS vector enforcement configuration can cause BIG-IP to get stuck in hardware syncookie mode.


Device is stuck in hardware syncookie mode and generates syncookies.


- Changing DOS vector enforcement configuration when device is in global syncookie mode. For a list of platforms that support hardware syncookie protection, see https://support.f5.com/csp/article/K14779


Run the following command: tmsh restart sys service tmm Impact of workaround: restarting tmm disrupts traffic.

Fix Information


Behavior Change