Last Modified: Aug 19, 2026
Affected Product(s):
BIG-IP APM
Known Affected Versions:
11.5.3, 11.5.3 hf1, 11.5.3 hf2, 11.6.0, 11.6.0 hf1, 11.6.0 hf2, 11.6.0 hf3, 11.6.0 hf4, 11.6.0 hf5, 11.6.0 hf6, 11.6.0 hf7, 11.6.0 hf8, 11.6.1, 11.6.1 hf1, 11.6.1 hf2, 11.6.2, 11.6.2 hf1, 11.6.3, 11.6.3.1, 11.6.3.2, 11.6.3.3, 11.6.3.4, 11.6.4, 11.6.5, 11.6.5.1, 11.6.5.2, 11.6.5.3
Fixed In:
12.0.0, 11.5.4
Opened: Jul 08, 2015 Severity: 2-Critical
Under unlikely circumstances, tmm threads may run into synchronization issue at startup initialization, causing BIG-IP Failover
Impact is BIG-IP will failover at start time. If tmm has successfully started - no further impact will be observed.
- SAML SSO or Form Based SSO are configured. - TMM is in process of starting (during reboot or for any other reason).
Remove Form Based SSO, and SAML objects from configuration.
A thread synchronization issue that caused tmm startup issues has been fixed.