I have one server (Windows Server 2012 R2) and I need to configure a LDAP users authentication in PHP. Server is domain controller, PHP (5.6) is installed and PHP already has LDAP extension. Bind with credentials in ldp.exe works.

WHAT I KNOW:

• LDAP connection works
• I can log on anonymously
• I cannot log in with user credentials (even with admin credentials)

I've tried edit policy "Default Domain Controller"

• Domain Controller: LDAP server signing requirements

  NONE

• Network Security: LDAP client signing requirements

  NEGOTIATE SIGNING

PHP CODE:

// using ldap bind
$ldaprdn  = 'bigboss';     // ldap rdn or dn
$ldappass = 'AdmiN123';  // associated password

// connect to ldap server
$ldapconn = ldap_connect("ldap://172.16.31.70")
    or die("Could not connect to LDAP server.");

if ($ldapconn) {
    // binding to ldap server
    $ldapbind = ldap_bind($ldapconn, $ldaprdn, $ldappass);
    // verify binding
    if ($ldapbind) {
        echo "LDAP bind successful...";
    } else {
        echo "LDAP bind failed...";
    }   
}