diff --git a/plinth/modules/bind/__init__.py b/plinth/modules/bind/__init__.py
index 963222fc9..bf5a8f097 100644
--- a/plinth/modules/bind/__init__.py
+++ b/plinth/modules/bind/__init__.py
@@ -36,11 +36,6 @@ _description = [
         box_name=_(cfg.box_name)),
 ]
 
-port_forwarding_info = [
-    ('TCP', 53),
-    ('UDP', 53),
-]
-
 CONFIG_FILE = '/etc/bind/named.conf.options'
 ZONES_DIR = '/var/bind/pri'
 
diff --git a/plinth/modules/bind/views.py b/plinth/modules/bind/views.py
index ab0cf9a55..d244687d4 100644
--- a/plinth/modules/bind/views.py
+++ b/plinth/modules/bind/views.py
@@ -7,10 +7,10 @@ from django.contrib import messages
 from django.utils.translation import ugettext_lazy as _
 
 from plinth import actions
-from plinth.views import AppView
 from plinth.modules import bind, names
+from plinth.views import AppView
 
-from . import get_config, port_forwarding_info
+from . import get_config
 from .forms import BindForm
 
 
@@ -19,7 +19,6 @@ class BindAppView(AppView):  # pylint: disable=too-many-ancestors
     app_id = 'bind'
     form_class = BindForm
     template_name = 'bind.html'
-    port_forwarding_info = port_forwarding_info
 
     def get_context_data(self, *args, **kwargs):
         """
diff --git a/plinth/modules/coturn/__init__.py b/plinth/modules/coturn/__init__.py
index ba3ae9338..d5309d8f6 100644
--- a/plinth/modules/coturn/__init__.py
+++ b/plinth/modules/coturn/__init__.py
@@ -36,18 +36,6 @@ _description = [
       'matrix-synapse need to be configured with the details provided here.'),
 ]
 
-port_forwarding_info = [
-    ('UDP', 3478),
-    ('TCP', 3478),
-    ('UDP', 3479),
-    ('TCP', 3479),
-    ('UDP', 5349),
-    ('TCP', 5349),
-    ('UDP', 5350),
-    ('TCP', 5350),
-    # XXX: Add relay ports here
-]
-
 app = None
 
 
diff --git a/plinth/modules/coturn/views.py b/plinth/modules/coturn/views.py
index 3d2b6c52d..d868a21b4 100644
--- a/plinth/modules/coturn/views.py
+++ b/plinth/modules/coturn/views.py
@@ -17,7 +17,6 @@ class CoturnAppView(views.AppView):
     app_id = 'coturn'
     template_name = 'coturn.html'
     form_class = forms.CoturnForm
-    port_forwarding_info = coturn.port_forwarding_info
 
     def get_context_data(self, **kwargs):
         """Return additional context for rendering the template."""
diff --git a/plinth/modules/ejabberd/__init__.py b/plinth/modules/ejabberd/__init__.py
index a85bda1c8..18b66174f 100644
--- a/plinth/modules/ejabberd/__init__.py
+++ b/plinth/modules/ejabberd/__init__.py
@@ -18,10 +18,10 @@ from plinth.modules import config
 from plinth.modules.apache.components import Webserver
 from plinth.modules.firewall.components import Firewall
 from plinth.modules.letsencrypt.components import LetsEncrypt
+from plinth.modules.users.components import UsersAndGroups
 from plinth.signals import (domain_added, post_hostname_change,
                             pre_hostname_change)
 from plinth.utils import format_lazy
-from plinth.modules.users.components import UsersAndGroups
 
 from .manifest import backup, clients  # noqa, pylint: disable=unused-import
 
@@ -46,12 +46,6 @@ _description = [
         jsxc_url=reverse_lazy('jsxc:index'))
 ]
 
-port_forwarding_info = [
-    ('TCP', 5222),
-    ('TCP', 5269),
-    ('TCP', 5280),
-]
-
 logger = logging.getLogger(__name__)
 
 app = None
diff --git a/plinth/modules/ejabberd/views.py b/plinth/modules/ejabberd/views.py
index 3714ae744..d96dbf271 100644
--- a/plinth/modules/ejabberd/views.py
+++ b/plinth/modules/ejabberd/views.py
@@ -18,7 +18,6 @@ class EjabberdAppView(AppView):
     app_id = 'ejabberd'
     template_name = 'ejabberd.html'
     form_class = EjabberdForm
-    port_forwarding_info = ejabberd.port_forwarding_info
 
     def get_initial(self):
         initdict = super().get_initial()
diff --git a/plinth/modules/firewall/components.py b/plinth/modules/firewall/components.py
index 4519b77ac..dd721861d 100644
--- a/plinth/modules/firewall/components.py
+++ b/plinth/modules/firewall/components.py
@@ -149,3 +149,23 @@ class Firewall(app.FollowerComponent):
             results.append([message, result])
 
         return results
+
+
+def get_port_forwarding_info(app_):
+    """Return a list of ports to be forwarded for this app to work."""
+    info = []
+    for component in app_.components.values():
+        if not isinstance(component, Firewall):
+            continue
+
+        if not component.is_external:
+            continue
+
+        for port in component.ports_details:
+            if port['name'] in ['http', 'https']:
+                continue
+
+            for detail in port['details']:
+                info.append((detail[1].upper(), detail[0]))
+
+    return info
diff --git a/plinth/modules/i2p/__init__.py b/plinth/modules/i2p/__init__.py
index f46b1ee2b..2b2c045c7 100644
--- a/plinth/modules/i2p/__init__.py
+++ b/plinth/modules/i2p/__init__.py
@@ -35,12 +35,6 @@ _description = [
       'configuration process.')
 ]
 
-port_forwarding_info = [
-    ('TCP', 4444),
-    ('TCP', 4445),
-    ('TCP', 6668),
-]
-
 tunnels_to_manage = {
     'I2P HTTP Proxy': 'i2p-http-proxy-freedombox',
     'I2P HTTPS Proxy': 'i2p-https-proxy-freedombox',
diff --git a/plinth/modules/i2p/views.py b/plinth/modules/i2p/views.py
index c5b3bfb56..181316d1a 100644
--- a/plinth/modules/i2p/views.py
+++ b/plinth/modules/i2p/views.py
@@ -4,7 +4,7 @@ Views for I2P application.
 """
 
 from django.utils.translation import ugettext as _
-from plinth.modules import i2p
+
 from plinth.views import AppView
 
 
@@ -29,7 +29,6 @@ class I2PAppView(AppView):
     def get_context_data(self, **kwargs):
         """Return the context data for rendering the template view."""
         context = super().get_context_data(**kwargs)
-        context['port_forwarding_info'] = i2p.port_forwarding_info
         context['proxies_description'] = self.proxies_description
         context['torrents_description'] = self.torrents_description
 
diff --git a/plinth/modules/infinoted/__init__.py b/plinth/modules/infinoted/__init__.py
index 2624942b6..3ded41f35 100644
--- a/plinth/modules/infinoted/__init__.py
+++ b/plinth/modules/infinoted/__init__.py
@@ -30,8 +30,6 @@ _description = [
         box_name=_(cfg.box_name)),
 ]
 
-port_forwarding_info = [('TCP', 6523)]
-
 app = None
 
 
diff --git a/plinth/modules/infinoted/urls.py b/plinth/modules/infinoted/urls.py
index eb1352b9c..5f67998d3 100644
--- a/plinth/modules/infinoted/urls.py
+++ b/plinth/modules/infinoted/urls.py
@@ -5,8 +5,9 @@ URLs for the infinoted module.
 
 from django.conf.urls import url
 
-from .views import InfinotedAppView
+from plinth.views import AppView
 
 urlpatterns = [
-    url(r'^apps/infinoted/$', InfinotedAppView.as_view(), name='index'),
+    url(r'^apps/infinoted/$', AppView.as_view(app_id='infinoted'),
+        name='index'),
 ]
diff --git a/plinth/modules/infinoted/views.py b/plinth/modules/infinoted/views.py
deleted file mode 100644
index 089354e4d..000000000
--- a/plinth/modules/infinoted/views.py
+++ /dev/null
@@ -1,12 +0,0 @@
-# SPDX-License-Identifier: AGPL-3.0-or-later
-"""
-Views for the infinoted app.
-"""
-from plinth.modules import infinoted
-from plinth.views import AppView
-
-
-class InfinotedAppView(AppView):
-    """Main app view for Infinoted."""
-    app_id = 'infinoted'
-    port_forwarding_info = infinoted.port_forwarding_info
diff --git a/plinth/modules/matrixsynapse/__init__.py b/plinth/modules/matrixsynapse/__init__.py
index 61307849a..99d221613 100644
--- a/plinth/modules/matrixsynapse/__init__.py
+++ b/plinth/modules/matrixsynapse/__init__.py
@@ -44,8 +44,6 @@ _description = [
       '<a href="https://element.io/">Element</a> client is recommended.')
 ]
 
-port_forwarding_info = [('TCP', 8448)]
-
 logger = logging.getLogger(__name__)
 
 SERVER_NAME_PATH = "/etc/matrix-synapse/conf.d/server_name.yaml"
diff --git a/plinth/modules/matrixsynapse/views.py b/plinth/modules/matrixsynapse/views.py
index c1a6e4a62..f8746b342 100644
--- a/plinth/modules/matrixsynapse/views.py
+++ b/plinth/modules/matrixsynapse/views.py
@@ -46,7 +46,6 @@ class MatrixSynapseAppView(AppView):
     app_id = 'matrixsynapse'
     template_name = 'matrix-synapse.html'
     form_class = MatrixSynapseForm
-    port_forwarding_info = matrixsynapse.port_forwarding_info
 
     def dispatch(self, request, *args, **kwargs):
         """Redirect to setup page if setup is not done yet."""
diff --git a/plinth/modules/minetest/__init__.py b/plinth/modules/minetest/__init__.py
index 9b8dfb435..0012e5edd 100644
--- a/plinth/modules/minetest/__init__.py
+++ b/plinth/modules/minetest/__init__.py
@@ -11,8 +11,8 @@ from plinth import app as app_module
 from plinth import cfg, frontpage, menu
 from plinth.daemon import Daemon
 from plinth.modules.firewall.components import Firewall
-from plinth.utils import format_lazy
 from plinth.modules.users.components import UsersAndGroups
+from plinth.utils import format_lazy
 
 from .manifest import backup, clients  # noqa, pylint: disable=unused-import
 
@@ -42,8 +42,6 @@ _description = [
           'is needed.'), box_name=_(cfg.box_name)),
 ]
 
-port_forwarding_info = [('UDP', 30000)]
-
 CONFIG_FILE = '/etc/minetest/minetest.conf'
 AUG_PATH = '/files' + CONFIG_FILE + '/.anon'
 
diff --git a/plinth/modules/minetest/views.py b/plinth/modules/minetest/views.py
index 4e4f6da63..a58dd659b 100644
--- a/plinth/modules/minetest/views.py
+++ b/plinth/modules/minetest/views.py
@@ -7,7 +7,7 @@ from django.contrib import messages
 from django.utils.translation import ugettext_lazy as _
 
 from plinth import actions
-from plinth.modules import minetest, names
+from plinth.modules import names
 from plinth.views import AppView
 
 from . import get_configuration
@@ -19,7 +19,6 @@ class MinetestAppView(AppView):  # pylint: disable=too-many-ancestors
     app_id = 'minetest'
     template_name = 'minetest.html'
     form_class = MinetestForm
-    port_forwarding_info = minetest.port_forwarding_info
 
     def get_initial(self):
         """Return the values to fill in the form."""
diff --git a/plinth/modules/mumble/__init__.py b/plinth/modules/mumble/__init__.py
index 31f347ffd..2f71b3766 100644
--- a/plinth/modules/mumble/__init__.py
+++ b/plinth/modules/mumble/__init__.py
@@ -28,11 +28,6 @@ _description = [
       'from your desktop and Android devices are available.')
 ]
 
-port_forwarding_info = [
-    ('TCP', 64738),
-    ('UDP', 64738),
-]
-
 app = None
 
 
diff --git a/plinth/modules/mumble/views.py b/plinth/modules/mumble/views.py
index 55bc178f6..a12ba76ce 100644
--- a/plinth/modules/mumble/views.py
+++ b/plinth/modules/mumble/views.py
@@ -3,14 +3,12 @@ from django.contrib import messages
 from django.utils.translation import ugettext_lazy as _
 
 from plinth import actions
-from plinth.modules.mumble import port_forwarding_info
 from plinth.modules.mumble.forms import MumbleForm
 from plinth.views import AppView
 
 
 class MumbleAppView(AppView):
     app_id = 'mumble'
-    port_forwarding_info = port_forwarding_info
     form_class = MumbleForm
 
     def form_valid(self, form):
diff --git a/plinth/modules/openvpn/__init__.py b/plinth/modules/openvpn/__init__.py
index 978239d91..0bb5d4de8 100644
--- a/plinth/modules/openvpn/__init__.py
+++ b/plinth/modules/openvpn/__init__.py
@@ -32,8 +32,6 @@ _description = [
           'for added security and anonymity.'), box_name=_(cfg.box_name))
 ]
 
-port_forwarding_info = [('UDP', 1194)]
-
 app = None
 
 setup_process = None
diff --git a/plinth/modules/openvpn/views.py b/plinth/modules/openvpn/views.py
index f8e917e90..8884bfbbc 100644
--- a/plinth/modules/openvpn/views.py
+++ b/plinth/modules/openvpn/views.py
@@ -22,7 +22,6 @@ class OpenVPNAppView(AppView):
     """Show OpenVPN app main page."""
     app_id = 'openvpn'
     template_name = 'openvpn.html'
-    port_forwarding_info = openvpn.port_forwarding_info
 
     def dispatch(self, request, *args, **kwargs):
         """Collect the result of running setup process."""
diff --git a/plinth/modules/quassel/__init__.py b/plinth/modules/quassel/__init__.py
index b883fe925..bee065c40 100644
--- a/plinth/modules/quassel/__init__.py
+++ b/plinth/modules/quassel/__init__.py
@@ -15,8 +15,8 @@ from plinth.daemon import Daemon
 from plinth.modules import names
 from plinth.modules.firewall.components import Firewall
 from plinth.modules.letsencrypt.components import LetsEncrypt
-from plinth.utils import format_lazy
 from plinth.modules.users.components import UsersAndGroups
+from plinth.utils import format_lazy
 
 from .manifest import backup, clients  # noqa, pylint: disable=unused-import
 
@@ -44,8 +44,6 @@ _description = [
       'are available.'),
 ]
 
-port_forwarding_info = [('TCP', 4242)]
-
 app = None
 
 
diff --git a/plinth/modules/quassel/views.py b/plinth/modules/quassel/views.py
index f8266b44c..12787e0b9 100644
--- a/plinth/modules/quassel/views.py
+++ b/plinth/modules/quassel/views.py
@@ -11,7 +11,6 @@ from .forms import QuasselForm
 
 class QuasselAppView(AppView):
     app_id = 'quassel'
-    port_forwarding_info = quassel.port_forwarding_info
     form_class = QuasselForm
 
     def get_initial(self):
diff --git a/plinth/modules/ssh/__init__.py b/plinth/modules/ssh/__init__.py
index d66fb6f78..3657fd849 100644
--- a/plinth/modules/ssh/__init__.py
+++ b/plinth/modules/ssh/__init__.py
@@ -32,8 +32,6 @@ _description = [
       'using such connections.')
 ]
 
-port_forwarding_info = [('TCP', 22)]
-
 app = None
 
 
diff --git a/plinth/modules/tahoe/__init__.py b/plinth/modules/tahoe/__init__.py
index e8cec9501..057bd54a1 100644
--- a/plinth/modules/tahoe/__init__.py
+++ b/plinth/modules/tahoe/__init__.py
@@ -37,11 +37,6 @@ _description = [
           'node to the other storage nodes.'), box_name=_(cfg.box_name)),
 ]
 
-port_forwarding_info = [
-    ('TCP', 3456),
-    ('TCP', 5678),
-]
-
 tahoe_home = '/var/lib/tahoe-lafs'
 introducer_name = 'introducer'
 storage_node_name = 'storage_node'
diff --git a/plinth/modules/tahoe/views.py b/plinth/modules/tahoe/views.py
index 4ddec91eb..82bfd6510 100644
--- a/plinth/modules/tahoe/views.py
+++ b/plinth/modules/tahoe/views.py
@@ -36,7 +36,6 @@ class TahoeAppView(AppView):
     """Show tahoe-lafs service page."""
     app_id = 'tahoe'
     template_name = 'tahoe-post-setup.html'
-    port_forwarding_info = tahoe.port_forwarding_info
 
     def dispatch(self, request, *args, **kwargs):
         if not tahoe.is_setup():
diff --git a/plinth/modules/wireguard/__init__.py b/plinth/modules/wireguard/__init__.py
index 771813a49..210bd216f 100644
--- a/plinth/modules/wireguard/__init__.py
+++ b/plinth/modules/wireguard/__init__.py
@@ -33,8 +33,6 @@ _description = [
         box_name=_(cfg.box_name))
 ]
 
-port_forwarding_info = [('UDP', 51820)]
-
 app = None
 
 SERVER_INTERFACE = 'wg0'
diff --git a/plinth/modules/wireguard/views.py b/plinth/modules/wireguard/views.py
index 43dbf3f75..1a4aabc31 100644
--- a/plinth/modules/wireguard/views.py
+++ b/plinth/modules/wireguard/views.py
@@ -13,7 +13,6 @@ from django.urls import reverse_lazy
 from django.utils.translation import ugettext as _
 from django.views.generic import FormView, TemplateView
 
-import plinth.modules.wireguard as wireguard
 from plinth import network
 from plinth.modules.names.components import DomainName
 from plinth.views import AppView
@@ -26,7 +25,6 @@ class WireguardView(AppView):
     app_id = 'wireguard'
     diagnostics_module_name = 'wireguard'
     template_name = 'wireguard.html'
-    port_forwarding_info = wireguard.port_forwarding_info
 
     def get_context_data(self, **kwargs):
         """Return additional context for rendering the template."""
diff --git a/plinth/views.py b/plinth/views.py
index d61e79356..4b8570ca7 100644
--- a/plinth/views.py
+++ b/plinth/views.py
@@ -19,6 +19,7 @@ from stronghold.decorators import public
 from plinth import app, package
 from plinth.daemon import app_is_running
 from plinth.modules.config import get_advanced_mode
+from plinth.modules.firewall.components import get_port_forwarding_info
 from plinth.translation import get_language_from_request, set_language
 
 from . import forms, frontpage
@@ -146,15 +147,10 @@ class AppView(FormView):
     to customize the appearance of the app to achieve more complex presentation
     instead of the simple appearance provided by default.
 
-    'port_forwarding_info' is a list of port information dictionaries that can
-    used to show a special section in the app page that tells the users how to
-    forward ports on their router for this app to work properly.
-
     """
     form_class = None
     app_id = None
     template_name = 'app.html'
-    port_forwarding_info = None
 
     def __init__(self, *args, **kwargs):
         """Initialize the view."""
@@ -254,7 +250,7 @@ class AppView(FormView):
         context['is_running'] = app_is_running(self.app)
         context['app_info'] = self.app.info
         context['has_diagnostics'] = self.app.has_diagnostics()
-        context['port_forwarding_info'] = self.port_forwarding_info
+        context['port_forwarding_info'] = get_port_forwarding_info(self.app)
         context['app_enable_disable_form'] = self.get_enable_disable_form()
 
         from plinth.modules.firewall.components import Firewall