Hi, I think there is a missing parameter in the security.user.provider.ldap service in the security.xml file (vendor/symfony/symfony/src/Symfony/Bundle/SecurityBundle/Resources/config/security.xml).

The missing parameter is the password_attribute.

<service id="security.user.provider.ldap" 
 class="Symfony\Component\Security\Core\User\LdapUserProvider" abstract="true" public="false">
 argument - security.ldap.ldap 
 argument  - base dn
 argument  - search dn
 argument  - search password
 argument  - default_roles
 argument  - uid key
 argument  - filter
 **argument  - SHOULD WE ADD A NEW ARGUMENT HERE FOR THE password_attribute ?**
</service>

Because when I try to use the LDAP provider in my security.yml file, Symfony throws me the next exception :

OutOfBoundsException in Definition.php line 202: The index "7" is not in the range [0, 6].

As a temporary workaround, I override the service in my service.yml to add the password_attribute parameter and it worked.

Thanks

EDIT: The Symfony version I'm using is 3.1