Authentication failed… but why?

I’ve seen similar posts but there don’t seem to be any answers. According to the plugin description “It is very easy to set up. Just activate the plugin, type in a domain controller, and you’re done.” I tried that but no dice.

The only [ERROR] is that authentication failed, but I don’t know why. Is there any more information I can get from this test tool? Or does anyone have any suggestions?

Things I’ve tried
– enable/disable TLS
– port 636 (although the response shows port 389 was good)
– prepending domain name i.i “domain\myuser.name”
– including a suffix (which we don’t even use)

Any hints as to WHY authentication is failing?

AD Integration Logon Test
openLDAP installed

[INFO] method authenticate() called
[INFO] ——————————————
PHP version: 5.5.38
WP version: 4.6
ADI version: 1.1.8
OS Info : Windows NT SERVERNAME 6.3 build 9600 (Windows Server 2012 R2 Datacenter Edition) i586
Web Server : cgi-fcgi
adLDAP ver.: 3.3.2 EXTENDED (201302271401)
——————————————
[INFO] LDAP paging: enabled
[NOTICE] username: myuser.name
[NOTICE] password: **not shown**
[INFO] Options for adLDAP connection:
– account_suffix:
– base_dn: dc=mydomain,dc=net
– domain_controllers: DC100
– ad_port: 389
– use_tls: 1
– network timeout: 5
[INFO] Checking domain controller ports:
[INFO] – DC100:389 – OK
[NOTICE] adLDAP object created.
[INFO] max_login_attempts: 3
[INFO] users failed logins: 0
[NOTICE] trying account suffix “”
[ERROR] Authentication failed
[WARN] storing failed login for user “myuser.name”

https://www.ads-software.com/plugins/active-directory-integration/