Bug ID 783617: Virtual server resets connections when all pool members are marked disabled

Last Modified: Jul 12, 2023

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

Known Affected Versions:
13.1.0, 13.1.0.1, 13.1.0.2, 13.1.0.3, 13.1.0.4, 13.1.0.5, 13.1.0.6, 13.1.0.7, 13.1.0.8, 13.1.1, 13.1.1.2, 13.1.1.3, 13.1.1.4, 13.1.1.5, 13.1.3, 13.1.3.1, 13.1.3.2, 13.1.3.3, 13.1.3.4, 14.0.0, 14.0.0.1, 14.0.0.2, 14.0.0.3, 14.0.0.4, 14.0.0.5, 14.0.1, 14.0.1.1, 14.1.0, 14.1.0.1, 14.1.0.2, 14.1.0.3, 14.1.0.5, 14.1.0.6, 14.1.2, 14.1.2.1, 14.1.2.2, 14.1.2.3, 14.1.2.4, 14.1.2.5, 14.1.2.6, 14.1.2.7, 14.1.2.8, 14.1.3, 15.0.0, 15.0.1, 15.0.1.1, 15.0.1.2, 15.0.1.3, 15.0.1.4

Fixed In:
15.1.0, 14.1.3.1, 13.1.3.5

Opened: May 20, 2019

Severity: 3-Major

Symptoms

The BIG-IP system immediately responds with an RST against a SYN when all pool members are marked disabled by a monitor.

Impact

Cannot use iRules to respond with an HTTP 503 error to incoming traffic. Cannot use LTM policies to select multiple pools if all pool members are disabled in a default pool assigned to a virtual server.

Conditions

All of the pool members are marked disabled by a monitor or administratively.

Workaround

Use Forced offline instead of disabled to prevent this issue.

Fix Information

Virtual server no longer resets connections when all pool members are marked disabled.

Behavior Change

Guides & references

K10134038: F5 Bug Tracker Filter Names and Tips