Bug ID 702457: DNS Cache connections remain open indefinitely

Last Modified: Mar 01, 2021

Bug Tracker

Affected Product:  See more info
BIG-IP DNS, GTM, LTM(all modules)

Known Affected Versions:
12.1.0, 12.1.0 HF1, 12.1.0 HF2, 12.1.1, 12.1.1 HF1, 12.1.1 HF2, 12.1.2, 12.1.2 HF1, 12.1.2 HF2, 12.1.3,,,,,,,, 12.1.4,, 12.1.5,,, 13.0.0, 13.0.0 HF1, 13.0.0 HF2, 13.0.0 HF3, 13.0.1, 13.1.0,,,,,,,,, 13.1.1,,, 14.0.0,,,,

Fixed In:

Opened: Jan 17, 2018
Severity: 3-Major


Resize / Clearing the DNS cache while a lot of traffic is running can cause numerous connections to remain open indefinitely. tmm crash


Connections remain open forever, using up memory


Resize / Clear the DNS Cache while it is resolving connections.


If you are encountering this, you can remove these connections by restarting tmm: tmsh restart sys service tmm Impact of workaround: Traffic disrupted while tmm restarts.

Fix Information

Fixed an issue where the DNS Cache kept connections open indefinitely when clearing or resizing a cache with active resolutions occurring.

Behavior Change