LDAP Authentication Error – ActiveSupport::MessagePack::UnserializableObjectError

Bug
1

Hi everyone,

I’m using the discourse-ldap-auth plugin on a self-hosted Discourse (Docker install).
After a recent rebuild, LDAP authentication started failing for all users.

Here’s the relevant error from production.log:

(ldap) Authentication failure! ldap_error: ActiveSupport::MessagePack::UnserializableObjectError,
Unsupported type Net::BER::BerIdentifiedString for object “******** (Kullanıcı Teknolojileri Yönetim Müdürlüğü)”
Started GET “/auth/failure?message=ldap_error&origin=http%3A%2F%2Fic*ot*rol.va**fb*nk.intra%2Flogin&strategy=ldap”
Processing by Users::OmniauthCallbacksController#failure as HTML
Completed 200 OK

Details

  • The issue affects all LDAP users.

  • All users in our LDAP directory have displayName values containing Turkish characters (ğ, ü, ş, İ, etc.).

  • The error occurs right after the LDAP authentication attempt — no user gets logged in.

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image1673×182 22.4 KB

Is this a general problem with the latest version of Discourse? Could it be related to a Ruby incompatibility? What solution do you suggest?

1 Like
2

Hallo Zusammen und Osmanmermer,
wir haben hier seit ein paar Tagen den gleichen Fehler:
(ldap) Authentication failure! ldap_error: ActiveSupport::MessagePack::UnserializableObjectError, Unsupported type Net::BER::BerIdentifiedString for object "username"

  • Das Problem betrifft im Moment die neu angelegten LDAP user die noch nie eingeloggt waren
  • Es ist unabhängig von Sonderzeichen
1 Like
3

I shifted this to Bug in case it is a bug introduced recently, since it appears to have affected two sites in s similar way.

Has anything changed on your end since last week? Has updating again fixed it?

4

Oops just noticed this odd not an official plugin so not officially supported. I also am not immediately finding the plugin topic. We should move this into there. Can someone help find it? I am on the move currently and not at my desk.