Bug ID 592682: TCP: connections may stall or be dropped

Last Modified: Oct 16, 2023

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

Known Affected Versions:
12.0.0 HF1, 12.0.0 HF2, 12.0.0 HF3, 12.0.0 HF4

Fixed In:
13.0.0, 12.1.0 HF1

Opened: May 11, 2016

Severity: 3-Major

Symptoms

TCP connections stall or get dropped.

Impact

This usually happens with rateshaper or BWC enabled. Rarely could also happen with very lossy networks.

Conditions

Under some network conditions especially with rateshaper enabled TCP connection could stall and ultimately get reset.

Workaround

None

Fix Information

Properly manage re-transmissions after a tail drop by not not doing the exponential back-off. Reset the re-transmit timer for every partial ack received after a tail drop.

Behavior Change

Guides & references

K10134038: F5 Bug Tracker Filter Names and Tips