Last Modified: Apr 28, 2025
Affected Product(s):
BIG-IP LTM
Known Affected Versions:
11.5.4, 11.5.4 HF1, 11.5.4 HF2, 11.5.4 HF3, 11.5.4 HF4, 11.5.5, 11.5.6, 11.5.7, 11.5.8, 11.5.9, 11.5.10, 12.1.2, 12.1.2 HF1, 12.1.2 HF2, 12.1.3, 13.0.0, 13.0.0 HF1, 13.0.0 HF2, 13.0.0 HF3
Fixed In:
13.1.0, 13.0.1, 12.1.3.1
Opened: May 04, 2017 Severity: 3-Major
Manually disabling an otherwise available pool member from a pool used as HSL TCP destination can result in tmm crash and service disruption. This is more likely to occur when HSL destination is using 'balanced' distribution.
Service disruption while tmm recovers. HA fail-over event. Traffic disrupted while tmm restarts.
-- Busy HSL destination configured with TCP protocol, balanced distribution, and using pool. -- Manually disabling a pool member.
You can avoid the issue in either of these ways: -- Do not manually disable busy pool members that can still respond to TCP handshake. -- Disable the service on the pool member first.
TMM crash no longer occurs when HSL TCP pool member with pending connection is manually disabled.