Wordpress和LDAP插件身份验证失败

我的系统管理员课程项目使用WordPress 3.9.1和OpenLDAP 2.4.31，运行一台Ubuntu服务器14.04 LTS vbox机器，ip 192.168.1.10。我尝试了几乎所有WordPress LDAP插件，只有LDAP LPRM可以工作，但我不喜欢它的映射角色功能，所以我宁愿使用Active Directory集成插件，但当我测试配置时，我得到：

AD Integration Logon Test

openLDAP installed

[INFO]   method authenticate() called
[INFO]   ------------------------------------------
         PHP version: 5.5.9-1ubuntu4
         WP  version: 3.9.1
         ADI version: 1.1.4
         OS Info    : Linux ubuntuserver 3.13.0-24-generic #47-Ubuntu SMP Fri May 2 23:31:42 UTC 2014 i686
         Web Server : apache2handler
         adLDAP ver.: 3.3.2 Extended (201104081456)
         ------------------------------------------
[NOTICE] username: mrossi
[NOTICE] password: **not shown**
[INFO]   Options for adLDAP connection:
         - account_suffix: 
         - base_dn: dc=asgobbin,dc=it
         - domain_controllers: 192.168.1.10
         - ad_port: 389
         - use_tls: 0
         - network timeout: 5
[NOTICE] adLDAP object created.
[INFO]   max_login_attempts: 300
[INFO]   users failed logins: 0
[NOTICE] trying account suffix ""
[ERROR]  Authentication failed
[WARN]   storing failed login for user "mrossi"

Logon failed

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