Bug ID 491030: Nitrox crypto accelerator can sometimes hang when encrypting SSL records

Last Modified: Oct 06, 2020

Bug Tracker

Affected Product:  See more info
BIG-IP APM, LTM(all modules)

Known Affected Versions:
11.6.0, 11.5.1, 11.5.0, 11.4.1, 11.4.0, 11.3.0, 11.2.1, 11.2.0, 11.1.0, 11.0.0, 10.2.4, 10.2.3, 10.2.2, 10.2.1, 10.2.0, 10.1.0, 10.0.1, 10.0.0

Fixed In:
12.0.0, 11.6.0 HF5, 11.5.2, 11.4.1 HF7, 11.2.1 HF15, 10.2.4 HF12

Opened: Nov 15, 2014
Severity: 2-Critical
Related AskF5 Article:


Sometimes when encrypting certain SSL records, the Cavium Nitrox crypto accelerator can hang with the LTM log message 'request queue stuck'.


Nitrox crypto accelerator can hang.


Certain SSL records on a system with a Cavium Nitrox card.


Rebooting the unit often frees up the Cavium Nitrox crypto accelerator chip, but should be considered a temporary solution and not a permanent fix, as the issue may return.

Fix Information

The Nitrox crypto accelerator no longer hangs with certain SSL records.

Behavior Change