Bug ID 1314597: Connection on standby may stay until idle timeout when receiving ICMP error

Last Modified: Apr 26, 2024

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

Known Affected Versions:
15.1.0,,,,,, 15.1.1, 15.1.2,, 15.1.3,, 15.1.4,, 15.1.5,, 15.1.6,, 15.1.7, 15.1.8,,, 15.1.9,, 15.1.10,,,, 16.1.0, 16.1.1, 16.1.2,,, 16.1.3,,,,,, 16.1.4,,,, 17.1.0,,,, 17.1.1,,,

Opened: Jun 28, 2023

Severity: 4-Minor


When a pool member server returns an ICMP error, connections will persist on standby while they have been terminated on active.


The connection will stay on the standby until the idle timeout expires.


When an ICMP error such as port unreachable is returned by a pool member, the packet will be dropped by the standby while the active will process it immediately and terminate the connection.


Lower idle timeout will reduce the time before it vanishes.

Fix Information


Behavior Change

Guides & references

K10134038: F5 Bug Tracker Filter Names and Tips