Last Modified: Nov 07, 2022
Affected Product:
See more info
BIG-IP LTM
Known Affected Versions:
11.5.1, 11.5.1 HF1, 11.5.1 HF10, 11.5.1 HF11, 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, 11.5.10, 11.5.2, 11.5.2 HF1, 11.5.3, 11.5.3 HF1, 11.5.3 HF2, 11.5.4, 11.5.4 HF1, 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
Fixed In:
12.0.0, 11.6.1, 11.5.4 HF2
Opened: Mar 18, 2015
Severity: 3-Major
Related Article:
K76190485
Occasionally, ACK is sent to server without SYN, connection get RST.
Some connections will be dropped.
1) FastL4 virtual server. 2) Hardware syncookie enabled. 3) Might more commonly occur with forwarding virtual servers. 4) Often happens when egress router has ARP timeout.
Configure a static ARP to all neighbors (routers) to avoid most issues.
An issue with hardware syncookies and FastL4 connections has been resolved.
