diff --git a/src/auth/auth_ldap.py b/src/auth/auth_ldap.py
index f9296877..5b645ed9 100644
--- a/src/auth/auth_ldap.py
+++ b/src/auth/auth_ldap.py
@@ -4,6 +4,7 @@
 from string import Template
 
 from ldap3 import Connection, SIMPLE
+from ldap3.core.exceptions import LDAPAttributeError
 
 from auth import auth_base
 from model import model_helper
@@ -62,6 +63,13 @@ def _load_multiple_entries_values(dn, search_filter, attribute_name, connection)
     return result
 
 
+def get_entry_dn(entry):
+    try:
+        return entry.entry_dn
+    except LDAPAttributeError:
+        return entry._dn
+
+
 class LdapAuthenticator(auth_base.Authenticator):
     def __init__(self, params_dict, temp_folder):
         super().__init__()
@@ -203,7 +211,7 @@ def _get_user_ids(self, full_username, connection):
             return full_username, None
 
         entry = entries[0]
-        return entry.entry_dn, entry.uid.value
+        return get_entry_dn(entry), entry.uid.value
 
     def _load_groups(self, groups_file):
         if not os.path.exists(groups_file):