Last Modified: Apr 28, 2025
Affected Product(s):
BIG-IP LTM
Known Affected Versions:
11.0.0, 11.1.0, 11.2.0, 11.2.1, 11.3.0, 11.4.0, 11.4.1, 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, 11.5.3, 11.5.3 HF1, 11.5.3 HF2, 11.6.0, 11.6.0 HF1, 11.6.0 HF2, 11.6.0 HF3, 11.6.0 HF4, 11.6.0 HF5, 11.6.0 HF6, 11.6.0 HF7, 11.6.0 HF8, 11.6.1, 11.6.1 HF1, 11.6.1 HF2, 11.6.2, 11.6.2 HF1
Fixed In:
12.0.0, 11.6.3, 11.5.4
Opened: Jun 17, 2014 Severity: 3-Major Related Article:
K17011
TCP syncookie and Selective NACK (profile option) causes traffic to be dropped.
Traffic might be dropped.
This occurs when the following conditions are met: -- Selective NACK enabled in TCP profile. -- TCP syncookie mode. -- No Selective NACK option in TCP options from client SYN.
Disable Selective NACK option in TCP profile.
TCP syncookie and Selective NACK (profile option) now works correctly.