diff --git a/inc/auth/ad.class.php b/inc/auth/ad.class.php
index a52f5f8b27e2710e51aabcf954a2000db65f25d9..9ae6dbbd161ab53b50336c30fba1c61de7a99e76 100644
--- a/inc/auth/ad.class.php
+++ b/inc/auth/ad.class.php
@@ -260,6 +260,9 @@ class auth_ad extends auth_basic {
             }
             return true;
         } catch (adLDAPException $e) {
+            if ($this->cnf['debug']) {
+                msg($e->getMessage(), -1);
+            }
             $this->success = false;
             $this->adldap  = null;
         }