Bug ID 502269: Large post requests may fail using form based SSO.

Last Modified: Oct 06, 2020

Bug Tracker

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

Known Affected Versions:
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, 11.6.0 HF5

Fixed In:
12.0.0, 11.6.0 HF6, 11.5.4

Opened: Jan 22, 2015
Severity: 2-Critical
Related AskF5 Article:


SSOV2 modifies the payload for big post requests and since the server does not understand this, so all such transactions fail.


SSOV2 is a very common use case for APM. Many applications are configured with SSOV2. Any large post in such case will fail.


Large post requests using form based SSO.


This issue has no workaround at this time.

Fix Information

The fix essentially does not modify the payload so the applications have no problem.

Behavior Change