diff --git a/htdocs/lib/ldap.class.php b/htdocs/lib/ldap.class.php
index 4d3b82e208e..ff507e155de 100644
--- a/htdocs/lib/ldap.class.php
+++ b/htdocs/lib/ldap.class.php
@@ -458,6 +458,7 @@ class Ldap
             */
             $this->ldapErrorCode = ldap_errno( $this->connection);
             $this->ldapErrorText = ldap_error( $this->connection);
+            $this->ldapDebugDomain = $domain;
             return false;
         }
     }
diff --git a/htdocs/main.inc.php b/htdocs/main.inc.php
index 8154effbb26..c79b0077465 100644
--- a/htdocs/main.inc.php
+++ b/htdocs/main.inc.php
@@ -320,6 +320,7 @@ if (! isset($_SESSION["dol_login"]))
 			$resultCheck=$ldap->checkPass($usertotest,$passwordtotest);
 			print $ldap->ldapErrorCode.'<br>';
 			print $ldap->ldapErrorText.'<br>';
+			print 'domain:'.$ldap->ldapDebugDomain.'<br>';
 			print 'result:'.$resultCheck.'<br>';
 			if ($resultCheck)
     	{