diff --git a/plinth/modules/datetime/__init__.py b/plinth/modules/datetime/__init__.py
index ad9ff12d0..a3d0eb585 100644
--- a/plinth/modules/datetime/__init__.py
+++ b/plinth/modules/datetime/__init__.py
@@ -51,7 +51,7 @@ def init():
 
     global service
     service = service_module.Service(
-        managed_services[0], title, is_external=False)
+        managed_services[0], title, ports=['ntp'], is_external=False)
 
 
 def setup(helper, old_version=None):
diff --git a/plinth/modules/minetest/__init__.py b/plinth/modules/minetest/__init__.py
index fa5b49071..9c90416e2 100644
--- a/plinth/modules/minetest/__init__.py
+++ b/plinth/modules/minetest/__init__.py
@@ -47,6 +47,7 @@ description = [
           'is needed.'), box_name=_(cfg.box_name)),
 ]
 
+
 def init():
     """Initialize the module."""
     menu = cfg.main_menu.get('apps:index')
@@ -54,7 +55,8 @@ def init():
 
     global service
     service = service_module.Service(
-        managed_services[0], title, is_external=True)
+        managed_services[0], title, ports=['minetest-plinth'],
+        is_external=True)
 
 
 def setup(helper, old_version=None):
diff --git a/plinth/modules/mumble/__init__.py b/plinth/modules/mumble/__init__.py
index ff5ea1dba..a54bd72bd 100644
--- a/plinth/modules/mumble/__init__.py
+++ b/plinth/modules/mumble/__init__.py
@@ -54,7 +54,7 @@ def init():
 
     global service
     service = service_module.Service(
-        managed_services[0], title, is_external=True)
+        managed_services[0], title, ports=['mumble-plinth'], is_external=True)
 
 
 class MumbleServiceView(ServiceView):
diff --git a/plinth/modules/privoxy/__init__.py b/plinth/modules/privoxy/__init__.py
index 52e345327..8108c4306 100644
--- a/plinth/modules/privoxy/__init__.py
+++ b/plinth/modules/privoxy/__init__.py
@@ -64,7 +64,7 @@ def init():
 
     global service
     service = service_module.Service(
-        managed_services[0], title, is_external=False)
+        managed_services[0], title, ports=['privoxy'], is_external=False)
 
 
 def setup(helper, old_version=None):
diff --git a/plinth/modules/quassel/__init__.py b/plinth/modules/quassel/__init__.py
index 2b5ab8c78..a9f737dfe 100644
--- a/plinth/modules/quassel/__init__.py
+++ b/plinth/modules/quassel/__init__.py
@@ -62,7 +62,7 @@ def init():
 
     global service
     service = service_module.Service(
-        managed_services[0], title, is_external=True)
+        managed_services[0], title, ports=['quassel-plinth'], is_external=True)
 
 
 class QuasselServiceView(ServiceView):
diff --git a/plinth/modules/shaarli/__init__.py b/plinth/modules/shaarli/__init__.py
index 0fdcecfa6..6e696bfe8 100644
--- a/plinth/modules/shaarli/__init__.py
+++ b/plinth/modules/shaarli/__init__.py
@@ -62,7 +62,6 @@ def setup(helper, old_version=None):
     helper.call('post', service.notify_enabled, None, True)
 
 
-
 def is_enabled():
     """Return whether the module is enabled."""
     return action_utils.webserver_is_enabled('shaarli')
diff --git a/plinth/modules/tor/__init__.py b/plinth/modules/tor/__init__.py
index 259288edc..08d2e13a2 100644
--- a/plinth/modules/tor/__init__.py
+++ b/plinth/modules/tor/__init__.py
@@ -58,7 +58,7 @@ def init():
 
     global socks_service
     socks_service = service_module.Service(
-        'tor-socks', _('Tor Anonymity Network'),
+        'tor-socks', _('Tor Anonymity Network'), ports=['tor-socks'],
         is_external=False, is_enabled=utils.is_enabled,
         is_running=utils.is_running)
 
diff --git a/plinth/modules/xmpp/__init__.py b/plinth/modules/xmpp/__init__.py
index dd97dbe76..2503a9a6f 100644
--- a/plinth/modules/xmpp/__init__.py
+++ b/plinth/modules/xmpp/__init__.py
@@ -63,7 +63,8 @@ def init():
     global service
     service = service_module.Service(
         'ejabberd', title, ports=['xmpp-client', 'xmpp-server', 'xmpp-bosh'],
-        is_external=True, is_enabled=is_enabled, enable=enable, disable=disable)
+        is_external=True, is_enabled=is_enabled, enable=enable,
+        disable=disable)
 
     pre_hostname_change.connect(on_pre_hostname_change)
     post_hostname_change.connect(on_post_hostname_change)