Login Failed

I get the following message when using the Test Tool.
Can anyone tell me what the problem is?

AD Integration Logon Test
openLDAP installed
[INFO] method authenticate() called
[INFO] ——————————————
PHP version: 5.4.24
WP version: 4.0
ADI version: 1.1.5dev
OS Info : Windows NT NET3 6.2 build 9200 (Unknown Windows version Standard Edition) i586
Web Server : cgi-fcgi
adLDAP ver.: 3.3.2 EXTENDED (201302271401)
——————————————
[INFO] LDAP paging: enabled
[NOTICE] username: administrator
[NOTICE] password: **not shown**
[INFO] Options for adLDAP connection:
– account_suffix:
– base_dn: cn=Users, dc=gsac, dc=local
– domain_controllers: gsac.local
– ad_port: 389
– use_tls: 0
– network timeout: 5
[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 “administrator”
Logon failed

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