Misleading warning message regarding LDAP - Authelia v4.39.16

[BatisteDONDOGLIO]

Upon startup, the Authelia systemd service reports the following warning:

The configured LDAP server advertises it supports LDAPv[3] but only LDAPv3 is supported. This server is not supported.

While it appears to be harmless, this warning sounds extremely misleading. I can confirm Authelia works fine and as expected. I'm using LLDAP as my authentication backend to manage my users/groups database.
I would appreciate some clarification around this message. What is it actually saying? It's unclear.

For reference, here's my Authelia configuration (the 'authentication_backend' section):

# User database settings
authentication_backend:
 ldap:
    address: 'ldap://127.0.0.1:3890'
    implementation: 'lldap'
    base_dn: 'dc=domain,dc=org'
    users_filter: '(&({username_attribute}={input})(objectClass=person))'
    additional_groups_dn: 'ou=groups'
    groups_filter: '(&(|(objectClass=groupOfNames)(objectClass=groupOfUniqueNames))(member={dn}))'
    attributes:
      username: 'uid'
      group_name: 'cn'
      mail: 'mail'
      display_name: 'displayName'
    group_search_mode: 'filter'
    user: 'uid=authelia,ou=people,dc=domain,dc=org'
    password: '<REDACTED>'

My LLDAP config:

verbose=false
ldap_host = "127.0.0.1"
ldap_port = 3890
http_host = "127.0.0.1"
http_port = 17170
jwt_secret = <REDACTED>
ldap_base_dn = "dc=domain,dc=org"
ldap_user_dn = "admin"
ldap_user_pass = <REDACTED>
force_ldap_user_pass_reset = "always"
database_url = "sqlite:///var/lib/lldap/users.db?mode=rwc"
key_file = ""
key_seed = <REDACTED>
[smtp_options]
[ldaps_options]

Environment:

The host is a LXC container running on Proxmox 9.1.6
Authelia v4.39.16
LLDAP v0.6.2
Linux kernel: 6.17.9-1-pve #1 SMP PREEMPT_DYNAMIC PMX 6.17.9-1 (2026-01-12T16:25Z) x86_64 GNU/Linux

Both Authelia and LLDAP are running on bare-metal on the same machine.
cat /etc/os-release:

PRETTY_NAME="Debian GNU/Linux 13 (trixie)"
NAME="Debian GNU/Linux"
VERSION_ID="13"
VERSION="13 (trixie)"
VERSION_CODENAME=trixie
DEBIAN_VERSION_FULL=13.4
ID=debian
HOME_URL="https://www.debian.org/"
SUPPORT_URL="https://www.debian.org/support"
BUG_REPORT_URL="https://bugs.debian.org/"

I could not find any similar discussions.

Thanks in advance!

[james-d-elliott]

This is already fixed in f24ef6b

[nightah]

This is a bug introduced by a refactor in 4.39.16.

It was picked up and fixed already in master f24ef6b.

It will be in the next release.