Bug ID 669737: TCL event CLIENT_DATA not fired when TCP data arrives before 3-way handshake finishes

Last Modified: Oct 16, 2023

Affected Product(s):
BIG-IP LTM(all modules)

Known Affected Versions:
12.1.2, 12.1.3, 12.1.3.1, 12.1.3.2, 12.1.3.3, 12.1.3.4, 12.1.3.5, 12.1.3.6, 12.1.3.7, 12.1.4, 12.1.4.1, 12.1.5, 12.1.5.1, 12.1.5.2, 12.1.5.3, 12.1.6

Opened: Jun 17, 2017

Severity: 3-Major

Symptoms

When data arrives before final ACK of TCP 3whs or inside final ACK of TCP 3whs, TCP doesn't generate CLIENT_DATA event. TCP only generates event CLIENT_ACCEPTED.

Impact

Connection stalls. Performance degradation.

Conditions

Whenever data arrives before final ACK of TCP 3whs or inside final ACK of TCP 3whs for a TCP connection.

Workaround

None

Fix Information

None

Behavior Change

Guides & references

K10134038: F5 Bug Tracker Filter Names and Tips