Last Modified: Apr 28, 2025
Affected Product(s):
BIG-IP LTM
Known Affected Versions:
11.5.0, 11.5.1, 11.5.1 HF1, 11.5.1 HF2, 11.5.1 HF3, 11.5.1 HF4, 11.5.1 HF5, 11.5.1 HF6, 11.5.1 HF7, 11.5.1 HF8, 11.5.1 HF9, 11.5.1 HF10, 11.5.1 HF11, 11.5.2, 11.5.2 HF1, 11.6.0, 11.6.0 HF1, 11.6.0 HF2, 11.6.0 HF3, 11.6.0 HF4
Fixed In:
12.0.0, 11.6.0 HF5, 11.5.3
Opened: Jan 23, 2015 Severity: 3-Major Related Article:
K16481
In certain corner cases, BIG-IP software rejects valid SYN-Cookie responses due to incorrect hardware algorithm masking on the software side.
Intermittent connection failures.
This issue appears only on hardware-SYN-Cookie-capable platforms when running the hardware SYN-Cookie algorithm.
Run software SYN-Cookie algorithm. Use the DB variable. This makes sure software is running correct generation and validation algorithm.
Traffic is now handled correctly in certain corner cases involving hardware syncookies.