Configuring LDAP authentication with Silex and Symfony 3

Silex security configuration works otherwise.
User providers are defined as $app['security.user_provider.%firewall_name%'], not as provider key in firewall config.

Try to change your config to:

$app['ldap'] = $app->share(function() {    return new Symfony\Component\Ldap\LdapClient('ldap.example.com');});$app['security.user_provider.stats'] = $app->share(function($app) {    return new \Symfony\Component\Security\Core\User\LdapUserProvider(        $app['ldap'],        'dc=example,dc=com',        null,        null,        ['ROLE_USER'],        'CN'    );});$app['security.authentication_provider.stats.dao'] = function () use ($app) {    return new \Symfony\Component\Security\Core\Authentication\Provider\LdapBindAuthenticationProvider(        $app['security.user_provider.stats'],        $app['security.user_checker'],        'stats',        $app['ldap'],        'CN={username},OU=DEV,DC=example,DC=com',        $app['security.hide_user_not_found']    );};$app->register(new Silex\Provider\SecurityServiceProvider(), [    'security.firewalls' => [        'stats' => [            'pattern' => '^/',            'http' => true,            'stateless' => true,        ],    ],]);

UPDATE: Or better use this decision Symfony LDAP auth bind with username and password. I think that it is better.