fix

jupyterhub_config.py

@@ -176,7 +176,7 @@ c = get_config()  #noqa
 #    - pam: jupyterhub.auth.PAMAuthenticator
 #  Default: 'jupyterhub.auth.PAMAuthenticator'
 c.JupyterHub.authenticator_class = 'nativeauthenticator.NativeAuthenticator'
-
+c.Authenticator.allow_all = True
 c.NativeAuthenticator.open_signup = True
 
 ## The base URL of the entire application.