Bug ID 825805: NTLM Auth may fail due to incorrect handling of EPM response

Last Modified: Jul 07, 2020

Bug Tracker

Affected Product:  See more info
BIG-IP APM, Install/Upgrade(all modules)

Known Affected Versions:
14.1.0,,,,,, 14.1.2,,, 15.0.0, 15.0.1,,

Fixed In:,

Opened: Sep 13, 2019
Severity: 3-Major


NTLM passthrough authentication may stop working after upgrade.


APM end users cannot login.


-- NTLM authentication configured. -- Upgraded to a BIG-IP software version that contains the implementation for the Microsoft Internet Explorer feature, 'Enhanced protected mode' (EPM). -- There are more than two protocol sequence towers included in the EPM response.



Fix Information

The system can now parse EPM response as expected.

Behavior Change