Netbox + LDAP Not working

[sueldol]

We have NetBox v4.4.5-Docker-3.4.1 installed with an external Postgres database. We create a local user (netbox_app) with admin permissions and it works fine.

The issue comes when we try to use LDAP to authenticate with our company AD users.

We follow the LDAP Wiki (https://github.com/netbox-community/netbox-docker/wiki/LDAP) but we have no luck.

Our logs show only these messages:

netbox-1 | INFO 2025-11-26 17:31:52,018 signals Failed login attempt for username: user1 from 192.168.2.XXXX
netbox-1 | DEBUG 2025-11-26 17:31:52,018 views Login form validation failed for username: user1

We are dealing with this for a couple of weeks now and nothing seems to be working.

We test the connection to our LDAP server using ldapsearch within the container and it works fine, the issue is when we try to login in the portal.

These are my config files so someone could help us figuring it out what could be the problem:

docker-compose.yml:

services:
  netbox: &netbox
    image: docker.io/netboxcommunity/netbox:${VERSION-v4.4-3.4.1}
    depends_on:
      - redis
      - redis-cache
    env_file: env/netbox.env
    user: "unit:root"
    environment:
        REMOTE_AUTH_ENABLED: "True"
        REMOTE_AUTH_BACKEND: "netbox.authentication.LDAPBackend"
        AUTH_LDAP_SERVER_URI: "ldaps://XXXXX.com.ar"
        AUTH_LDAP_BIND_DN: "CN=LDAPdesa,OU=Usuarios_Aplicaciones,DC=XXXX,DC=com,DC=ar"
        AUTH_LDAP_BIND_PASSWORD: "XXXXX"
        AUTH_LDAP_USER_SEARCH_BASEDN: "DC=XXXX,DC=com,DC=ar"
        AUTH_LDAP_GROUP_SEARCH_BASEDN: "DC=XXXXX,DC=com,DC=ar"
        AUTH_LDAP_REQUIRE_GROUP_DN: "CN=Infraestructura,OU=Grupos,DC=XXXXX,DC=com,DC=ar"
        AUTH_LDAP_GROUP_TYPE: "NestedGroupOfNamesType"
        AUTH_LDAP_IS_ADMIN_DN: "CN=Infraestructura,OU=Grupos,DC=XXXX,DC=com,DC=ar"
        AUTH_LDAP_IS_SUPERUSER_DN: "CN=Infraestructura,OU=Grupos,DC=XXXXX,DC=com,DC=ar"
        LDAP_IGNORE_CERT_ERRORS: "true"

configuration/configuration.py:

REMOTE_AUTH_ENABLED = True

AUTHENTICATION_BACKENDS = [
    'netbox.authentication.LDAPBackend'
    'django_auth_ldap.backend.LDAPBackend',
    'django.contrib.auth.backends.ModelBackend',
    'netbox.authentication.ObjectPermissionBackend',
]

LOGGING = {
    'version': 1,
    'disable_existing_loggers': False,
    'formatters': {
        'verbose': {
            'format': '{levelname} {asctime} {module} {message}',
            'style': '{',
        },
    },
    'handlers': {
        'console': {
            'level': 'DEBUG',
            'class': 'logging.StreamHandler',
            'formatter': 'verbose',
        },
    },
    'loggers': {
        'django_auth_ldap': {
            'handlers': ['console'],
            'level': 'DEBUG', # Esto activa la depuración detallada para LDAP
            'propagate': True,
        },
        'ldap': {
            'handlers': ['console'],
            'level': 'DEBUG',
            'propagate': True,
        },
        '': {
            'handlers': ['console'],
            'level': 'DEBUG',
            'propagate': False,
        },
    },
}

configuration/ldap/ldap_config.py:
configuration/ldap/extra.py
These files have not modifications, the are in the default state.

Hope someone can share some light and help us with this!!

Thank you all in advanced!