Bug ID 531761: Web navigation flow may be reset when main page responds with non-HTML content

Last Modified: Nov 07, 2022

Bug Tracker

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

Known Affected Versions:
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

Opened: Jul 03, 2015
Severity: 3-Major


In some web applications, the navigation flow may break (connection reset) if a main URL (login page, for example) is responding with a content that is not an HTML one, or if the response is dynamic, and occasionally not an HTML one.


Users may experience a connection reset while navigating through the website, usually after several minutes.


Proactive Bot Defense is enabled on a DOS profile that is attached to a Virtual Server, and one of the main URLs of the web application (login page, home page, etc.) occasionally responds with a non-HTML content, blank content, or redirect response with no body.



Fix Information

Connection resets are no longer experienced on normal web navigation of a site that is protected by the Proactive Bot Defense mechanism, and one of the main pages of the web application occasionally responds with a non-HTML content.

Behavior Change