Bug ID 756698: After upgrade, nlad may not create an schannel to a domain controller

Last Modified: Jan 20, 2023

Bug Tracker

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

Known Affected Versions:
14.1.0,,,,,, 14.1.2,,,,,,,,, 14.1.3,, 14.1.4,,,,,,, 14.1.5,,,, 15.0.0, 15.0.1,,,,, 15.1.0,,,,,, 15.1.1, 15.1.2,, 15.1.3,, 15.1.4,, 15.1.5,, 15.1.6,, 15.1.7, 15.1.8,

Opened: Jan 27, 2019
Severity: 3-Major


Upgrading to v14.1.0 or later, the nlad daemon cannot create Microsoft Secure Channel (Schannel) connections to configured domain controllers after reboot. The system posts errors in the /var/log/apm logfile similar to the following: err eca[5290]: 0162000e:3: Failed to resolve DC FQDN (example.example.com), Name or service not known (-2).


NTLM authentication might fail for APM end users. No NTLM communication to back-end Domain Controller while nlad restarts.


-- Upgrading the BIG-IP system to v14.1.0 or later. -- NTLM front-end authentication is configured.


Run the following command to restart nlad: bigstart restart nlad eca

Fix Information


Behavior Change