Last Modified: Apr 28, 2025
Affected Product(s):
BIG-IP TMOS
Known Affected Versions:
14.1.5, 14.1.5.1, 14.1.5.2, 14.1.5.3, 14.1.5.4, 14.1.5.6, 15.1.5.1, 15.1.6, 15.1.6.1, 15.1.7, 15.1.8, 15.1.8.1, 15.1.8.2
Fixed In:
17.1.0, 15.1.9
Opened: Jun 23, 2022 Severity: 3-Major
Due to an algorithm mismatch in software and hardware, valid TCP connections may get rejected with "No flow found for ACK' reset-cause when the hardware SYN cookie mode is active.
Service degradation.
- BIG-IP iSeries appliances with ePVA support and the B2250 and B44xx VIPRION blades. - Hardware SYN cookie mode is activated.
- Disable the hardware SYN cookie mode globally. - After a reboot, restart the TMM for an additional time.
The SYN cookie hash algorithm is correctly selected on all TMMs.