diff --git a/app/services/quickwin_snapshot_service.py b/app/services/quickwin_snapshot_service.py
index 6ef3575..1adecc3 100644
--- a/app/services/quickwin_snapshot_service.py
+++ b/app/services/quickwin_snapshot_service.py
@@ -164,21 +164,40 @@ def snapshot_server(hostname, vm_name, branch, db, snap_name=None):
     if not vcenters:
         return {"ok": False, "vcenter": "", "detail": "Aucun vCenter actif configure", "skipped": True}
 
+    login_failures = []
+    not_found_on = []
     for vc in vcenters:
         si = _connect_vcenter(vc.endpoint, vc_user, vc_pass)
         if not si:
+            login_failures.append(vc.name)
             continue
         try:
             vm = _find_vm(si, search_name)
             if vm:
                 ok, msg = _take_snapshot(vm, snap_name,
-                                         description=f"QuickWin auto-snapshot {hostname}")
+                                         description=f"PatchCenter snapshot {hostname}")
                 return {"ok": ok, "vcenter": vc.name, "detail": msg}
+            not_found_on.append(vc.name)
         finally:
             try:
                 Disconnect(si)
             except Exception:
                 pass
 
-    tried = ", ".join(vc.name for vc in vcenters)
-    return {"ok": False, "vcenter": "", "detail": f"VM '{search_name}' non trouvee sur: {tried}"}
+    # Tous les vCenters épuisés sans match → message précis
+    if login_failures and not not_found_on:
+        return {
+            "ok": False, "vcenter": "",
+            "detail": (f"Échec login sur tous les vCenters ({', '.join(login_failures)}). "
+                       "Vérifier vsphere_user/vsphere_pass dans Settings > vSphere "
+                       "(format attendu : user@vsphere.local ou DOMAIN\\\\user)."),
+            "skipped": True,
+        }
+    if login_failures:
+        return {
+            "ok": False, "vcenter": "",
+            "detail": (f"VM '{search_name}' non trouvée sur {', '.join(not_found_on)} ; "
+                       f"login KO sur {', '.join(login_failures)}"),
+        }
+    return {"ok": False, "vcenter": "",
+            "detail": f"VM '{search_name}' non trouvée sur : {', '.join(not_found_on)}"}