diff --git a/src/plugins/networkinformationbackends/networkmanager/qnetworkmanagernetworkinformationbackend.cpp b/src/plugins/networkinformationbackends/networkmanager/qnetworkmanagernetworkinformationbackend.cpp
index 1356078ee0a..f0627c092a4 100644
--- a/src/plugins/networkinformationbackends/networkmanager/qnetworkmanagernetworkinformationbackend.cpp
+++ b/src/plugins/networkinformationbackends/networkmanager/qnetworkmanagernetworkinformationbackend.cpp
@@ -91,7 +91,8 @@ public:
 
     static QNetworkInformation::Features featuresSupportedStatic()
     {
-        return QNetworkInformation::Features(QNetworkInformation::Feature::Reachability);
+        using Feature = QNetworkInformation::Feature;
+        return QNetworkInformation::Features(Feature::Reachability | Feature::CaptivePortal);
     }
 
     bool isValid() const { return iface.isValid(); }
@@ -145,6 +146,19 @@ QNetworkManagerNetworkInformationBackend::QNetworkManagerNetworkInformationBacke
             setReachability(reachabilityFromNMState(prevState));
         }
     });
+
+    using ConnectivityState = QNetworkManagerInterface::NMConnectivityState;
+    using TriState = QNetworkInformation::TriState;
+
+    const auto connectivityState = iface.connectivityState();
+    const bool behindPortal = (connectivityState == ConnectivityState::NM_CONNECTIVITY_PORTAL);
+    setBehindCaptivePortal(behindPortal ? TriState::True : TriState::False);
+
+    connect(&iface, &QNetworkManagerInterface::connectivityChanged, this,
+            [this](ConnectivityState state) {
+                const bool behindPortal = (state == ConnectivityState::NM_CONNECTIVITY_PORTAL);
+                setBehindCaptivePortal(behindPortal ? TriState::True : TriState::False);
+            });
 }
 
 QT_END_NAMESPACE
diff --git a/src/plugins/networkinformationbackends/networkmanager/qnetworkmanagerservice.cpp b/src/plugins/networkinformationbackends/networkmanager/qnetworkmanagerservice.cpp
index 12ee52675cd..bf9f156cb24 100644
--- a/src/plugins/networkinformationbackends/networkmanager/qnetworkmanagerservice.cpp
+++ b/src/plugins/networkinformationbackends/networkmanager/qnetworkmanagerservice.cpp
@@ -105,14 +105,25 @@ QNetworkManagerInterface::NMState QNetworkManagerInterface::state()
     return QNetworkManagerInterface::NM_STATE_UNKNOWN;
 }
 
+QNetworkManagerInterface::NMConnectivityState QNetworkManagerInterface::connectivityState() const
+{
+    if (propertyMap.contains("Connectivity"))
+        return static_cast<NMConnectivityState>(propertyMap.value("Connectivity").toUInt());
+    return QNetworkManagerInterface::NM_CONNECTIVITY_UNKNOWN;
+}
+
 void QNetworkManagerInterface::setProperties(const QMap<QString, QVariant> &map)
 {
     for (auto i = map.cbegin(), end = map.cend(); i != end; ++i) {
         const bool isState = i.key() == QLatin1String("State");
+        const bool isConnectivity = i.key() == QLatin1String("Connectivity");
         bool stateUpdate = isState;
+        bool connectivityUpdate = isConnectivity;
+
         auto it = propertyMap.lowerBound(i.key());
         if (it != propertyMap.end() && it.key() == i.key()) {
             stateUpdate &= (it.value() != i.value());
+            connectivityUpdate &= (it.value() != i.value());
             *it = *i;
         } else {
             propertyMap.insert(it, i.key(), i.value());
@@ -121,6 +132,9 @@ void QNetworkManagerInterface::setProperties(const QMap<QString, QVariant> &map)
         if (stateUpdate) {
             quint32 state = i.value().toUInt();
             Q_EMIT stateChanged(state);
+        } else if (connectivityUpdate) {
+            quint32 state = i.value().toUInt();
+            Q_EMIT connectivityChanged(static_cast<NMConnectivityState>(state));
         }
     }
 }
diff --git a/src/plugins/networkinformationbackends/networkmanager/qnetworkmanagerservice.h b/src/plugins/networkinformationbackends/networkmanager/qnetworkmanagerservice.h
index 9624eaa216a..067ade6cbdd 100644
--- a/src/plugins/networkinformationbackends/networkmanager/qnetworkmanagerservice.h
+++ b/src/plugins/networkinformationbackends/networkmanager/qnetworkmanagerservice.h
@@ -109,14 +109,26 @@ public:
         NM_STATE_CONNECTED_GLOBAL = 70
     };
     Q_ENUM(NMState);
+    // Matches 'NMConnectivityState' from
+    // https://developer.gnome.org/NetworkManager/stable/nm-dbus-types.html#NMConnectivityState
+    enum NMConnectivityState {
+        NM_CONNECTIVITY_UNKNOWN = 0,
+        NM_CONNECTIVITY_NONE = 1,
+        NM_CONNECTIVITY_PORTAL = 2,
+        NM_CONNECTIVITY_LIMITED = 3,
+        NM_CONNECTIVITY_FULL = 4,
+    };
+    Q_ENUM(NMConnectivityState);
 
     QNetworkManagerInterface(QObject *parent = nullptr);
     ~QNetworkManagerInterface();
 
     NMState state();
+    NMConnectivityState connectivityState() const;
 
 Q_SIGNALS:
     void stateChanged(quint32);
+    void connectivityChanged(NMConnectivityState);
 
 private Q_SLOTS:
     void setProperties(const QMap<QString, QVariant> &map);