Index: /trunk/src/VBox/Main/GuestImpl.cpp
===================================================================
--- /trunk/src/VBox/Main/GuestImpl.cpp	(revision 29583)
+++ /trunk/src/VBox/Main/GuestImpl.cpp	(revision 29584)
@@ -981,4 +981,9 @@
                             rc = setError(VBOX_E_IPRT_ERROR,
                                           tr("The guest reported an unknown process status (%u)"), pData->u32Status);
+                        }
+                        else if (vrc == VERR_PERMISSION_DENIED)
+                        {
+                            rc = setError(VBOX_E_IPRT_ERROR,
+                                          tr("Invalid user/password credentials"));
                         }
                         else