Bug ID 493140: Incorrect persistence entries are created when invoking cookie hash persistence within an iRule using offset and length parameters.

Last Modified: Oct 06, 2020

Bug Tracker

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

Known Affected Versions:
11.4.1, 11.5.1, 11.5.1 HF1, 11.5.1 HF10, 11.5.1 HF11, 11.5.1 HF2, 11.5.1 HF3, 11.5.1 HF4, 11.5.1 HF5, 11.5.1 HF6, 11.5.1 HF7, 11.5.1 HF8, 11.5.1 HF9, 11.5.10, 11.5.2, 11.5.2 HF1, 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

Fixed In:
12.0.0, 11.6.0 HF5, 11.5.4

Opened: Nov 26, 2014
Severity: 3-Major
Related AskF5 Article:


When using a cookie hash persistence profile and an iRule to provide finer granularity using offset and length parameters to calculate the hash, the system creates incorrect persistence entries.


Incorrect persistence entries are created.


Cookie hash persistence profile and iRule on top of that specifies offset and length of the cookie to be used for hashing is needed.



Fix Information

Using cookie hash persistence and invoking cookie hash persistence from within an iRule now works as expected.

Behavior Change