diff --git a/pymanager/manager.py b/pymanager/manager.py
index 07c0c62..3392f8e 100755
--- a/pymanager/manager.py
+++ b/pymanager/manager.py
@@ -394,8 +394,8 @@ class ManageHttpRequest(http.server.SimpleHTTPRequestHandler):
         """
         logging.debug('post recieved : %s' % self.path)
         if not self.check_authentication():
-            self.send_error(400, 'Bad authentication')
-            logging.error("Bad authentication")
+            self.send_error(403, 'Wrong authentication')
+            logging.error("Wrong authentication")
         elif self.path == '/START':
             self._send_command("START")
         elif self.path == '/STOP':