Hi, This is my config... I'm using Active Directory to authenticate agent. When using only the first 6 lines it works ok. The problem only come when I add another 3 lines to control who's in. I get Login failed! Your username or password was entered incorrectly. Even using the root@localhost account. Did I miss anything? $Self->{'AuthModule'} = 'Kernel::System::Auth::LDAP'; $Self->{'AuthModule::LDAP::Host'} = 'server1.mycompany.com'; $Self->{'AuthModule::LDAP::BaseDN'} = 'ou=Users,ou=MyCompany,ou=Site1,dc=mycompany,dc=com'; $Self->{'AuthModule::LDAP::UID'} = 'sAMAccountName'; $Self->{'AuthModule::LDAP::SearchUserDN'} = 'cn=OTRS Admin,ou=Users,ou=MyCompany,ou=Site1,dc=mycompany,dc=com'; $Self->{'AuthModule::LDAP::SearchUserPw'} = 'somepassword'; $Self->{'AuthModule::LDAP::GroupDN'} = 'cn=Domain Group Information Systems,ou=Groups Security,ou=MyCompany,ou=Site1,dc=mycompany,dc=com'; $Self->{'AuthModule::LDAP::AccessAttr'} = 'memberUid'; $Self->{'AuthModule::LDAP::UserAttr'} = 'DN'; Cheers.