Last Modified: Aug 19, 2026
Affected Product(s):
BIG-IP TMOS
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, 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, 12.0.0, 12.0.0 hf1, 12.0.0 hf2, 12.0.0 hf3, 12.0.0 hf4, 12.1.0, 12.1.0 hf1, 12.1.0 hf2
Fixed In:
13.0.0, 12.1.1
Opened: May 03, 2016 Severity: 3-Major
After creating a new sync-failover device group without network failover enabled, both devices remain Active.
Both device in the HA pair will be Active, which is unlikely to pass traffic successfully.
Create a new sync-failover device-group without enabling network failover.
After adding the 2nd device to the sync-failover group, restart sod with "bigstart restart sod" on both devices.
After creating the sync-failover group with without network failover configured, but a serial failover cable installed, one of the devices becomes Standby and the other remains Active.