Bug ID 480370: Connections to virtual servers with port-preserve property will cause connections to leak in TMM

Last Modified: Nov 07, 2022

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

Known Affected Versions:
11.4.0, 11.4.1, 11.5.0, 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, 11.6.0, 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, 11.4.1 HF9

Opened: Sep 22, 2014

Severity: 2-Critical

Related Article: K17147


Connections leak, exhausting the memory over time and causing TMM to re-start.


TMM process re-starts causing traffic disruption. Low performance is also seen due to the high number of leaked connections.


Virtual server with port-preserve setting. Tunneled APM connections in a CMP environment (many TMM processes).



Fix Information

The internal listeners that are created to forward the connections between TMM processes are now deleted when no longer needed, so new connections are not created, which prevents a memory leak.

Behavior Change

Guides & references

K10134038: F5 Bug Tracker Filter Names and Tips