diff --git a/covas_mobile/lib/main.dart b/covas_mobile/lib/main.dart
index 46cf42b..d5f8833 100644
--- a/covas_mobile/lib/main.dart
+++ b/covas_mobile/lib/main.dart
@@ -45,7 +45,45 @@ class _LoginDemoState extends State<LoginDemo> {
             MaterialPageRoute(
                 builder: (_) => MyHomePage(title: 'Flutter Demo')));
       } else {
-        showErrorDialog(context, "Probleme d'authentification");
+        var text = "";
+        switch (response.statusCode) {
+          case 400:
+            {
+              text = "Requête mal construite";
+            }
+            break;
+          case 406:
+            {
+              text = "Mot de passe incorrect";
+            }
+            break;
+          case 404:
+            {
+              text = "Utilisateur inconnu";
+            }
+            break;
+          case 403:
+            {
+              text = "Utilisateur desactive";
+            }
+            break;
+          case 410:
+            {
+              text = "Token invalide";
+            }
+            break;
+          case 500:
+            {
+              text = "Probleme interne du serveur";
+            }
+            break;
+          default:
+            {
+              text = "Probleme d'authentification inconnu";
+            }
+            break;
+        }
+        showErrorDialog(context, text);
       }
     } else {
       showErrorDialog(context, "Champ vide");