diff --git a/gns3server/handlers/api/iou_handler.py b/gns3server/handlers/api/iou_handler.py
index dbc3d923..ff32ce1f 100644
--- a/gns3server/handlers/api/iou_handler.py
+++ b/gns3server/handlers/api/iou_handler.py
@@ -65,10 +65,6 @@ class IOUHandler:
                 if name == "private_config_content" and (vm.private_config_content and len(vm.private_config_content) > 0):
                     continue
                 setattr(vm, name, value)
-        if "startup_config_content" in request.json:
-            vm.startup_config = request.json.get("startup_config_content")
-        if "private_config_content" in request.json:
-            vm.private_config = request.json.get("private_config_content")
         response.set_status(201)
         response.json(vm)
 
@@ -112,14 +108,9 @@ class IOUHandler:
 
         iou_manager = IOU.instance()
         vm = iou_manager.get_vm(request.match_info["vm_id"], project_id=request.match_info["project_id"])
-
         for name, value in request.json.items():
             if hasattr(vm, name) and getattr(vm, name) != value:
                 setattr(vm, name, value)
-        if "startup_config_content" in request.json:
-            vm.startup_config = request.json.get("startup_config_content")
-        if "private_config_content" in request.json:
-            vm.private_config = request.json.get("private_config_content")
         response.json(vm)
 
     @classmethod
diff --git a/gns3server/modules/iou/iou_vm.py b/gns3server/modules/iou/iou_vm.py
index fb610ccf..8bbd8bb8 100644
--- a/gns3server/modules/iou/iou_vm.py
+++ b/gns3server/modules/iou/iou_vm.py
@@ -1064,6 +1064,14 @@ class IOUVM(BaseVM):
                 else:
                     startup_config = startup_config.replace("%h", self._name)
                     f.write(startup_config)
+
+            vlan_file = os.path.join(self.working_dir, "vlan.dat-{:05d}".format(self.application_id))
+            if os.path.exists(vlan_file):
+                try:
+                    os.remove(vlan_file)
+                except OSError as e:
+                    log.error("Could not delete VLAN file '{}': {}".format(vlan_file, e))
+
         except OSError as e:
             raise IOUError("Can't write startup-config file '{}': {}".format(startup_config_path, e))