Bug ID 621808: Proactive Bot Defense failing in IE11 with Compatibility View enabled

Last Modified: May 14, 2019

Bug Tracker

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

Known Affected Versions:
12.0.0, 12.0.0 HF1, 12.0.0 HF2, 12.0.0 HF3, 12.0.0 HF4, 12.1.0, 12.1.0 HF1, 12.1.0 HF2, 12.1.1, 12.1.1 HF1, 12.1.1 HF2

Fixed In:
13.0.0, 12.1.2

Opened: Oct 11, 2016
Severity: 3-Major

Symptoms

Internet Explorer 11 browsers which have "Compatibility View" enabled (under Compatibility View Settings IE menu), will fail the JavaScript challenge, when Proactive Bot Defense is enabled and the "Block requests from suspicious browsers" checkbox is checked. The challenged request will be blocked using a TCP_RST flag, and the browser will show "This page can't be displayed" is seen in the browser.

Impact

Legitimate browsers get blocked when accessing the site.

Conditions

1. DoS profile that is attached to the Virtual Server has Proactive Bot Defense is enabled and "Block requests from suspicious browsers" checkbox is checked. 2. Internet Explorer 11 browsers in which the site's domain is inserted to the "Compatibility View Settings" in the browser's menu.

Workaround

None

Fix Information

Internet Explorer 11 browsers with "Compatibility View" enabled on the site no longer get blocked when Proactive Bot Defense is enabled on the DoS profile.

Behavior Change