Bug ID 445329: DNS cache resolver connections can be slow to terminate

Last Modified: Oct 06, 2020

Bug Tracker

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

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

Fixed In:
11.6.0, 11.5.3

Opened: Jan 17, 2014
Severity: 1-Blocking
Related AskF5 Article:


An excessive number of DNS cache resolver connections can build up if local configuration errors (routing, interfaces, VLANs) exist.


An excessive number of outbound DNS cache connections are present.


Local networking configuration errors exist.


Ensure default routes for IPv4 and IPv6 are properly configured and operational.

Fix Information

Local connection errors now cause immediate connection termination.

Behavior Change