diff --git a/framework/src/android/net/NetworkCapabilities.java b/framework/src/android/net/NetworkCapabilities.java
index ed9df56..ec71d3d 100644
--- a/framework/src/android/net/NetworkCapabilities.java
+++ b/framework/src/android/net/NetworkCapabilities.java
@@ -1585,6 +1585,28 @@
     }
 
     /**
+     * Compare if the given NetworkCapabilities have the same UIDs.
+     *
+     * @hide
+     */
+    public static boolean hasSameUids(@Nullable NetworkCapabilities nc1,
+            @Nullable NetworkCapabilities nc2) {
+        final Set<UidRange> uids1 = (nc1 == null) ? null : nc1.mUids;
+        final Set<UidRange> uids2 = (nc2 == null) ? null : nc2.mUids;
+        if (null == uids1) return null == uids2;
+        if (null == uids2) return false;
+        // Make a copy so it can be mutated to check that all ranges in uids2 also are in uids.
+        final Set<UidRange> uids = new ArraySet<>(uids2);
+        for (UidRange range : uids1) {
+            if (!uids.contains(range)) {
+                return false;
+            }
+            uids.remove(range);
+        }
+        return uids.isEmpty();
+    }
+
+    /**
      * Tests if the set of UIDs that this network applies to is the same as the passed network.
      * <p>
      * This test only checks whether equal range objects are in both sets. It will
@@ -1600,19 +1622,7 @@
      */
     @VisibleForTesting
     public boolean equalsUids(@NonNull NetworkCapabilities nc) {
-        Set<UidRange> comparedUids = nc.mUids;
-        if (null == comparedUids) return null == mUids;
-        if (null == mUids) return false;
-        // Make a copy so it can be mutated to check that all ranges in mUids
-        // also are in uids.
-        final Set<UidRange> uids = new ArraySet<>(mUids);
-        for (UidRange range : comparedUids) {
-            if (!uids.contains(range)) {
-                return false;
-            }
-            uids.remove(range);
-        }
-        return uids.isEmpty();
+        return hasSameUids(nc, this);
     }
 
     /**
diff --git a/service/src/com/android/server/ConnectivityService.java b/service/src/com/android/server/ConnectivityService.java
index 48ae7a0..899286b 100644
--- a/service/src/com/android/server/ConnectivityService.java
+++ b/service/src/com/android/server/ConnectivityService.java
@@ -7348,6 +7348,8 @@
             mDnsManager.updateTransportsForNetwork(
                     nai.network.getNetId(), newNc.getTransportTypes());
         }
+
+        maybeSendProxyBroadcast(nai, prevNc, newNc);
     }
 
     /** Convenience method to update the capabilities for a given network. */
@@ -7440,6 +7442,30 @@
         maybeCloseSockets(nai, ranges, exemptUids);
     }
 
+    private boolean isProxySetOnAnyDefaultNetwork() {
+        ensureRunningOnConnectivityServiceThread();
+        for (final NetworkRequestInfo nri : mDefaultNetworkRequests) {
+            final NetworkAgentInfo nai = nri.getSatisfier();
+            if (nai != null && nai.linkProperties.getHttpProxy() != null) {
+                return true;
+            }
+        }
+        return false;
+    }
+
+    private void maybeSendProxyBroadcast(NetworkAgentInfo nai, NetworkCapabilities prevNc,
+            NetworkCapabilities newNc) {
+        // When the apps moved from/to a VPN, a proxy broadcast is needed to inform the apps that
+        // the proxy might be changed since the default network satisfied by the apps might also
+        // changed.
+        // TODO: Try to track the default network that apps use and only send a proxy broadcast when
+        //  that happens to prevent false alarms.
+        if (nai.isVPN() && nai.everConnected && !NetworkCapabilities.hasSameUids(prevNc, newNc)
+                && (nai.linkProperties.getHttpProxy() != null || isProxySetOnAnyDefaultNetwork())) {
+            mProxyTracker.sendProxyBroadcast();
+        }
+    }
+
     private void updateUids(NetworkAgentInfo nai, NetworkCapabilities prevNc,
             NetworkCapabilities newNc) {
         Set<UidRange> prevRanges = null == prevNc ? null : prevNc.getUidRanges();
diff --git a/tests/common/java/android/net/NetworkAgentConfigTest.kt b/tests/common/java/android/net/NetworkAgentConfigTest.kt
index 2b45b3d..afaae1c 100644
--- a/tests/common/java/android/net/NetworkAgentConfigTest.kt
+++ b/tests/common/java/android/net/NetworkAgentConfigTest.kt
@@ -59,6 +59,7 @@
 
     @Test @IgnoreUpTo(Build.VERSION_CODES.Q)
     fun testBuilder() {
+        val testExtraInfo = "mylegacyExtraInfo"
         val config = NetworkAgentConfig.Builder().apply {
             setExplicitlySelected(true)
             setLegacyType(ConnectivityManager.TYPE_ETHERNET)
@@ -67,6 +68,7 @@
             setUnvalidatedConnectivityAcceptable(true)
             setLegacyTypeName("TEST_NETWORK")
             if (isAtLeastS()) {
+                setLegacyExtraInfo(testExtraInfo)
                 setNat64DetectionEnabled(false)
                 setProvisioningNotificationEnabled(false)
                 setBypassableVpn(true)
@@ -80,6 +82,7 @@
         assertTrue(config.isUnvalidatedConnectivityAcceptable())
         assertEquals("TEST_NETWORK", config.getLegacyTypeName())
         if (isAtLeastS()) {
+            assertEquals(testExtraInfo, config.getLegacyExtraInfo())
             assertFalse(config.isNat64DetectionEnabled())
             assertFalse(config.isProvisioningNotificationEnabled())
             assertTrue(config.isBypassableVpn())
diff --git a/tests/cts/hostside/app/src/com/android/cts/net/hostside/VpnTest.java b/tests/cts/hostside/app/src/com/android/cts/net/hostside/VpnTest.java
index 532fd86..8485263 100755
--- a/tests/cts/hostside/app/src/com/android/cts/net/hostside/VpnTest.java
+++ b/tests/cts/hostside/app/src/com/android/cts/net/hostside/VpnTest.java
@@ -17,6 +17,7 @@
 package com.android.cts.net.hostside;
 
 import static android.Manifest.permission.NETWORK_SETTINGS;
+import static android.net.ConnectivityManager.TYPE_VPN;
 import static android.net.NetworkCapabilities.TRANSPORT_VPN;
 import static android.os.Process.INVALID_UID;
 import static android.system.OsConstants.AF_INET;
@@ -759,6 +760,7 @@
         assertEquals(vpnNetwork, mCM.getActiveNetwork());
         assertNotEqual(defaultNetwork, vpnNetwork);
         maybeExpectVpnTransportInfo(vpnNetwork);
+        assertTrue(mCM.getNetworkInfo(vpnNetwork).getType() == TYPE_VPN);
 
         if (SdkLevel.isAtLeastS()) {
             // Check that system default network callback has not seen any network changes, even
diff --git a/tests/cts/net/src/android/net/cts/ConnectivityManagerTest.java b/tests/cts/net/src/android/net/cts/ConnectivityManagerTest.java
index acec9a4..ae59dc4 100644
--- a/tests/cts/net/src/android/net/cts/ConnectivityManagerTest.java
+++ b/tests/cts/net/src/android/net/cts/ConnectivityManagerTest.java
@@ -152,6 +152,7 @@
 import com.android.networkstack.apishim.common.ConnectivityManagerShim;
 import com.android.testutils.CompatUtil;
 import com.android.testutils.DevSdkIgnoreRule;
+import com.android.testutils.DevSdkIgnoreRule.IgnoreUpTo;
 import com.android.testutils.DevSdkIgnoreRuleKt;
 import com.android.testutils.RecorderCallback.CallbackEntry;
 import com.android.testutils.SkipPresubmit;
@@ -674,6 +675,31 @@
                 .build();
     }
 
+    @Test @IgnoreUpTo(Build.VERSION_CODES.Q)
+    public void testIsPrivateDnsBroken() throws InterruptedException {
+        final String invalidPrivateDnsServer = "invalidhostname.example.com";
+        final String goodPrivateDnsServer = "dns.google";
+        mCtsNetUtils.storePrivateDnsSetting();
+        final TestableNetworkCallback cb = new TestableNetworkCallback();
+        mCm.registerNetworkCallback(makeWifiNetworkRequest(), cb);
+        try {
+            // Verifying the good private DNS sever
+            mCtsNetUtils.setPrivateDnsStrictMode(goodPrivateDnsServer);
+            final Network networkForPrivateDns =  mCtsNetUtils.ensureWifiConnected();
+            cb.eventuallyExpect(CallbackEntry.NETWORK_CAPS_UPDATED, NETWORK_CALLBACK_TIMEOUT_MS,
+                    entry -> (!((CallbackEntry.CapabilitiesChanged) entry).getCaps()
+                    .isPrivateDnsBroken()) && networkForPrivateDns.equals(entry.getNetwork()));
+
+            // Verifying the broken private DNS sever
+            mCtsNetUtils.setPrivateDnsStrictMode(invalidPrivateDnsServer);
+            cb.eventuallyExpect(CallbackEntry.NETWORK_CAPS_UPDATED, NETWORK_CALLBACK_TIMEOUT_MS,
+                    entry -> (((CallbackEntry.CapabilitiesChanged) entry).getCaps()
+                    .isPrivateDnsBroken()) && networkForPrivateDns.equals(entry.getNetwork()));
+        } finally {
+            mCtsNetUtils.restorePrivateDnsSetting();
+        }
+    }
+
     /**
      * Exercises both registerNetworkCallback and unregisterNetworkCallback. This checks to
      * see if we get a callback for the TRANSPORT_WIFI transport type being available.
diff --git a/tests/cts/net/src/android/net/cts/NetworkRequestTest.java b/tests/cts/net/src/android/net/cts/NetworkRequestTest.java
index bca4456..637ed26 100644
--- a/tests/cts/net/src/android/net/cts/NetworkRequestTest.java
+++ b/tests/cts/net/src/android/net/cts/NetworkRequestTest.java
@@ -30,6 +30,7 @@
 
 import static junit.framework.Assert.fail;
 
+import static org.junit.Assert.assertArrayEquals;
 import static org.junit.Assert.assertEquals;
 import static org.junit.Assert.assertFalse;
 import static org.junit.Assert.assertNotEquals;
@@ -456,6 +457,21 @@
         }
     }
 
+    @Test @IgnoreUpTo(Build.VERSION_CODES.R)
+    public void testGetCapabilities() {
+        final int[] netCapabilities = new int[] {
+                NET_CAPABILITY_INTERNET,
+                NET_CAPABILITY_NOT_ROAMING };
+        final NetworkCapabilities.Builder builder = NetworkCapabilities.Builder
+                .withoutDefaultCapabilities();
+        for (int capability : netCapabilities) builder.addCapability(capability);
+        final NetworkRequest nr = new NetworkRequest.Builder()
+                .clearCapabilities()
+                .setCapabilities(builder.build())
+                .build();
+        assertArrayEquals(netCapabilities, nr.getCapabilities());
+    }
+
     @Test
     public void testBuildRequestFromExistingRequestWithBuilder() {
         assumeTrue(TestUtils.shouldTestSApis());
diff --git a/tests/unit/java/com/android/server/ConnectivityServiceTest.java b/tests/unit/java/com/android/server/ConnectivityServiceTest.java
index 4530650..be7239d 100644
--- a/tests/unit/java/com/android/server/ConnectivityServiceTest.java
+++ b/tests/unit/java/com/android/server/ConnectivityServiceTest.java
@@ -486,6 +486,7 @@
     @Mock VpnProfileStore mVpnProfileStore;
     @Mock SystemConfigManager mSystemConfigManager;
     @Mock Resources mResources;
+    @Mock ProxyTracker mProxyTracker;
 
     private ArgumentCaptor<ResolverParamsParcel> mResolverParamsParcelCaptor =
             ArgumentCaptor.forClass(ResolverParamsParcel.class);
@@ -1280,10 +1281,14 @@
             return mMockNetworkAgent;
         }
 
-        public void establish(LinkProperties lp, int uid, Set<UidRange> ranges, boolean validated,
-                boolean hasInternet, boolean isStrictMode) throws Exception {
+        private void setOwnerAndAdminUid(int uid) throws Exception {
             mNetworkCapabilities.setOwnerUid(uid);
             mNetworkCapabilities.setAdministratorUids(new int[]{uid});
+        }
+
+        public void establish(LinkProperties lp, int uid, Set<UidRange> ranges, boolean validated,
+                boolean hasInternet, boolean isStrictMode) throws Exception {
+            setOwnerAndAdminUid(uid);
             registerAgent(false, ranges, lp);
             connect(validated, hasInternet, isStrictMode);
             waitForIdle();
@@ -1638,7 +1643,7 @@
         doReturn(mNetIdManager).when(deps).makeNetIdManager();
         doReturn(mNetworkStack).when(deps).getNetworkStack();
         doReturn(mSystemProperties).when(deps).getSystemProperties();
-        doReturn(mock(ProxyTracker.class)).when(deps).makeProxyTracker(any(), any());
+        doReturn(mProxyTracker).when(deps).makeProxyTracker(any(), any());
         doReturn(true).when(deps).queryUserAccess(anyInt(), any(), any());
         doAnswer(inv -> {
             mPolicyTracker = new WrappedMultinetworkPolicyTracker(
@@ -10382,16 +10387,23 @@
 
     @Test
     public void testVpnUidRangesUpdate() throws Exception {
-        LinkProperties lp = new LinkProperties();
+        // Set up a WiFi network without proxy.
+        mWiFiNetworkAgent = new TestNetworkAgentWrapper(TRANSPORT_WIFI);
+        mWiFiNetworkAgent.connect(true);
+        assertNull(mService.getProxyForNetwork(null));
+        assertNull(mCm.getDefaultProxy());
+
+        final LinkProperties lp = new LinkProperties();
         lp.setInterfaceName("tun0");
         lp.addRoute(new RouteInfo(new IpPrefix(Inet4Address.ANY, 0), null));
         lp.addRoute(new RouteInfo(new IpPrefix(Inet6Address.ANY, 0), null));
         final UidRange vpnRange = PRIMARY_UIDRANGE;
-        Set<UidRange> vpnRanges = Collections.singleton(vpnRange);
+        final Set<UidRange> vpnRanges = Collections.singleton(vpnRange);
         mMockVpn.establish(lp, VPN_UID, vpnRanges);
         assertVpnUidRangesUpdated(true, vpnRanges, VPN_UID);
+        // VPN is connected but proxy is not set, so there is no need to send proxy broadcast.
+        verify(mProxyTracker, never()).sendProxyBroadcast();
 
-        reset(mMockNetd);
         // Update to new range which is old range minus APP1, i.e. only APP2
         final Set<UidRange> newRanges = new HashSet<>(Arrays.asList(
                 new UidRange(vpnRange.start, APP1_UID - 1),
@@ -10401,6 +10413,101 @@
 
         assertVpnUidRangesUpdated(true, newRanges, VPN_UID);
         assertVpnUidRangesUpdated(false, vpnRanges, VPN_UID);
+
+        // Uid has changed but proxy is not set, so there is no need to send proxy broadcast.
+        verify(mProxyTracker, never()).sendProxyBroadcast();
+
+        final ProxyInfo testProxyInfo = ProxyInfo.buildDirectProxy("test", 8888);
+        lp.setHttpProxy(testProxyInfo);
+        mMockVpn.sendLinkProperties(lp);
+        waitForIdle();
+        // Proxy is set, so send a proxy broadcast.
+        verify(mProxyTracker, times(1)).sendProxyBroadcast();
+        reset(mProxyTracker);
+
+        mMockVpn.setUids(vpnRanges);
+        waitForIdle();
+        // Uid has changed and proxy is already set, so send a proxy broadcast.
+        verify(mProxyTracker, times(1)).sendProxyBroadcast();
+        reset(mProxyTracker);
+
+        // Proxy is removed, send a proxy broadcast.
+        lp.setHttpProxy(null);
+        mMockVpn.sendLinkProperties(lp);
+        waitForIdle();
+        verify(mProxyTracker, times(1)).sendProxyBroadcast();
+        reset(mProxyTracker);
+
+        // Proxy is added in WiFi(default network), setDefaultProxy will be called.
+        final LinkProperties wifiLp = mCm.getLinkProperties(mWiFiNetworkAgent.getNetwork());
+        assertNotNull(wifiLp);
+        wifiLp.setHttpProxy(testProxyInfo);
+        mWiFiNetworkAgent.sendLinkProperties(wifiLp);
+        waitForIdle();
+        verify(mProxyTracker, times(1)).setDefaultProxy(eq(testProxyInfo));
+        reset(mProxyTracker);
+    }
+
+    @Test
+    public void testProxyBroadcastWillBeSentWhenVpnHasProxyAndConnects() throws Exception {
+        // Set up a WiFi network without proxy.
+        mWiFiNetworkAgent = new TestNetworkAgentWrapper(TRANSPORT_WIFI);
+        mWiFiNetworkAgent.connect(true);
+        assertNull(mService.getProxyForNetwork(null));
+        assertNull(mCm.getDefaultProxy());
+
+        final LinkProperties lp = new LinkProperties();
+        lp.setInterfaceName("tun0");
+        lp.addRoute(new RouteInfo(new IpPrefix(Inet4Address.ANY, 0), null));
+        lp.addRoute(new RouteInfo(new IpPrefix(Inet6Address.ANY, 0), null));
+        final ProxyInfo testProxyInfo = ProxyInfo.buildDirectProxy("test", 8888);
+        lp.setHttpProxy(testProxyInfo);
+        final UidRange vpnRange = PRIMARY_UIDRANGE;
+        final Set<UidRange> vpnRanges = Collections.singleton(vpnRange);
+        mMockVpn.setOwnerAndAdminUid(VPN_UID);
+        mMockVpn.registerAgent(false, vpnRanges, lp);
+        // In any case, the proxy broadcast won't be sent before VPN goes into CONNECTED state.
+        // Otherwise, the app that calls ConnectivityManager#getDefaultProxy() when it receives the
+        // proxy broadcast will get null.
+        verify(mProxyTracker, never()).sendProxyBroadcast();
+        mMockVpn.connect(true /* validated */, true /* hasInternet */, false /* isStrictMode */);
+        waitForIdle();
+        assertVpnUidRangesUpdated(true, vpnRanges, VPN_UID);
+        // Vpn is connected with proxy, so the proxy broadcast will be sent to inform the apps to
+        // update their proxy data.
+        verify(mProxyTracker, times(1)).sendProxyBroadcast();
+    }
+
+    @Test
+    public void testProxyBroadcastWillBeSentWhenTheProxyOfNonDefaultNetworkHasChanged()
+            throws Exception {
+        // Set up a CELLULAR network without proxy.
+        mCellNetworkAgent = new TestNetworkAgentWrapper(TRANSPORT_CELLULAR);
+        mCellNetworkAgent.connect(true);
+        assertNull(mService.getProxyForNetwork(null));
+        assertNull(mCm.getDefaultProxy());
+        // CELLULAR network should be the default network.
+        assertEquals(mCellNetworkAgent.getNetwork(), mCm.getActiveNetwork());
+
+        // Set up a WiFi network without proxy.
+        mWiFiNetworkAgent = new TestNetworkAgentWrapper(TRANSPORT_WIFI);
+        mWiFiNetworkAgent.connect(true);
+        assertNull(mService.getProxyForNetwork(null));
+        assertNull(mCm.getDefaultProxy());
+        // WiFi network should be the default network.
+        assertEquals(mWiFiNetworkAgent.getNetwork(), mCm.getActiveNetwork());
+        // CELLULAR network is not the default network.
+        assertNotEquals(mCellNetworkAgent.getNetwork(), mCm.getActiveNetwork());
+
+        // CELLULAR network is not the system default network, but it might be a per-app default
+        // network. The proxy broadcast should be sent once its proxy has changed.
+        final LinkProperties cellularLp = new LinkProperties();
+        cellularLp.setInterfaceName(MOBILE_IFNAME);
+        final ProxyInfo testProxyInfo = ProxyInfo.buildDirectProxy("test", 8888);
+        cellularLp.setHttpProxy(testProxyInfo);
+        mCellNetworkAgent.sendLinkProperties(cellularLp);
+        waitForIdle();
+        verify(mProxyTracker, times(1)).sendProxyBroadcast();
     }
 
     @Test