Allow Synapse manhole to be enabled

Can you double check that the way I have this set only exposes it locally? It is important that the manhole is not available to the outside world since it is quite powerful and the password is hard coded.

roles/matrix-synapse/templates/synapse/homeserver.yaml.j2

@@ -229,11 +229,13 @@ listeners:
         compress: false
 {% endif %}
 
+{% if matrix_synapse_manhole_enabled %}
   # Turn on the twisted ssh manhole service on localhost on the given
   # port.
-  # - port: 9000
-  #   bind_addresses: ['::1', '127.0.0.1']
-  #   type: manhole
+  - port: 9000
+    bind_addresses: ['0.0.0.0']
+    type: manhole
+{% endif %}
 
 
 ## Homeserver blocking ##