Bug ID 790089: ASM SPA JavaScript code causes a web page to hang upon parallel ajax requests.

Last Modified: Oct 16, 2019

Bug Tracker

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

Known Affected Versions:
13.1.0,,,,,,,,, 13.1.1,,,,,, 13.1.3,, 14.0.0,,,,,, 14.0.1, 14.1.0,,,,,,, 14.1.2,, 15.0.0, 15.0.1

Opened: Jun 05, 2019
Severity: 2-Critical


A web page hangs when parallel AJAX requests being sent.


Web-page processing halts; endless loading image is posted.


-- ASM provisioned. -- Single Page Application (SPA) enabled Bot Defense, DoS, or ASM Policy. -- Bot Defense, DoS, or ASM Policy attached to a virtual server. -- A web page sends two or more parallel AJAX requests.


The issue was introduced in the May-2019 live-update file. Rolling back to the Apr-2019 file avoids the issue.

Fix Information


Behavior Change