diff --git a/Tethering/Android.bp b/Tethering/Android.bp
index ecbaf61..37060df 100644
--- a/Tethering/Android.bp
+++ b/Tethering/Android.bp
@@ -210,5 +210,4 @@
 sdk {
     name: "tethering-module-sdk",
     bootclasspath_fragments: ["com.android.tethering-bootclasspath-fragment"],
-    systemserverclasspath_fragments: ["com.android.tethering-systemserverclasspath-fragment"],
 }
diff --git a/Tethering/apex/Android.bp b/Tethering/apex/Android.bp
index ea3f8d6..e16e56f 100644
--- a/Tethering/apex/Android.bp
+++ b/Tethering/apex/Android.bp
@@ -22,16 +22,16 @@
 // different value depending on the branch.
 java_defaults {
     name: "ConnectivityNextEnableDefaults",
-    enabled: true,
+    enabled: false,
 }
 apex_defaults {
     name: "ConnectivityApexDefaults",
     // Tethering app to include in the AOSP apex. Branches that disable the "next" targets may use
     // a stable tethering app instead, but will generally override the AOSP apex to use updatable
     // package names and keys, so that apex will be unused anyway.
-    apps: ["TetheringNext"], // Replace to "Tethering" if ConnectivityNextEnableDefaults is false.
+    apps: ["Tethering"], // Replace to "Tethering" if ConnectivityNextEnableDefaults is false.
 }
-enable_tethering_next_apex = true
+enable_tethering_next_apex = false
 // This is a placeholder comment to avoid merge conflicts
 // as the above target may have different "enabled" values
 // depending on the branch
@@ -45,8 +45,8 @@
     bootclasspath_fragments: [
         "com.android.tethering-bootclasspath-fragment",
     ],
-    systemserverclasspath_fragments: [
-        "com.android.tethering-systemserverclasspath-fragment",
+    java_libs: [
+        "service-connectivity",
     ],
     multilib: {
         first: {
@@ -100,7 +100,7 @@
     name: "com.android.tethering-bootclasspath-fragment",
     contents: [
         "framework-connectivity",
-        "framework-connectivity-tiramisu",
+        // Changed in sc-mainline-prod only: no framework-connectivity-tiramisu
         "framework-tethering",
     ],
     apex_available: ["com.android.tethering"],
@@ -123,22 +123,18 @@
     // modified by the Soong or platform compat team.
     hidden_api: {
         max_target_r_low_priority: [
-            "hiddenapi/hiddenapi-max-target-r-loprio.txt",
+            // Changed in sc-mainline-prod only: no list for
+            // framework-connectivity-tiramisu APIs as it is not in the APEX
 	],
         max_target_o_low_priority: [
             "hiddenapi/hiddenapi-max-target-o-low-priority.txt",
-            "hiddenapi/hiddenapi-max-target-o-low-priority-tiramisu.txt",
+            // Changed in sc-mainline-prod only: no list for
+            // framework-connectivity-tiramisu APIs as it is not in the APEX
 	],
         unsupported: ["hiddenapi/hiddenapi-unsupported.txt"],
     },
 }
 
-systemserverclasspath_fragment {
-    name: "com.android.tethering-systemserverclasspath-fragment",
-    standalone_contents: ["service-connectivity"],
-    apex_available: ["com.android.tethering"],
-}
-
 override_apex {
     name: "com.android.tethering.inprocess",
     base: "com.android.tethering",
diff --git a/buildstubs-t/Android.bp b/buildstubs-t/Android.bp
new file mode 100644
index 0000000..dfca6b3
--- /dev/null
+++ b/buildstubs-t/Android.bp
@@ -0,0 +1,49 @@
+//
+// Copyright (C) 2021 The Android Open Source Project
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+
+package {
+    // See: http://go/android-license-faq
+    default_applicable_licenses: ["Android-Apache-2.0"],
+}
+
+// Placeholder empty filegroups to avoid merge conflicts on build rules
+// on a branch that does not have the filegroups
+
+filegroup {
+    name: "framework-connectivity-tiramisu-updatable-sources",
+    srcs: [],
+}
+
+filegroup {
+    name: "services.connectivity-tiramisu-updatable-sources",
+    srcs: ["stubs-src/**/*.java"],
+}
+
+// Empty replacement for framework-connectivity-tiramisu.impl and stubs,
+// as framework-connectivity is disabled in the branch
+java_library {
+    name: "framework-connectivity-tiramisu.impl",
+    min_sdk_version: "Tiramisu",
+    sdk_version: "module_current",
+    srcs: [],
+}
+
+java_library {
+    name: "framework-connectivity-tiramisu.stubs.module_lib",
+    min_sdk_version: "Tiramisu",
+    sdk_version: "module_current",
+    srcs: [],
+}
diff --git a/buildstubs-t/stubs-src/com/android/server/NsdService.java b/buildstubs-t/stubs-src/com/android/server/NsdService.java
new file mode 100644
index 0000000..8e32ffd
--- /dev/null
+++ b/buildstubs-t/stubs-src/com/android/server/NsdService.java
@@ -0,0 +1,76 @@
+/*
+ * Copyright (C) 2021 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.android.server;
+
+import android.content.Context;
+import android.os.IBinder;
+import android.os.IInterface;
+import android.os.Parcel;
+import android.os.RemoteException;
+
+import java.io.FileDescriptor;
+
+/**
+ * Fake NsdService class for sc-mainline-prod,
+ * to allow building the T service-connectivity before sources
+ * are moved to the branch
+ */
+public final class NsdService implements IBinder {
+    /** Create instance */
+    public static NsdService create(Context ctx) throws InterruptedException {
+        throw new RuntimeException("This is a stub class");
+    }
+
+    @Override
+    public String getInterfaceDescriptor() throws RemoteException {
+        return null;
+    }
+
+    @Override
+    public boolean pingBinder() {
+        return false;
+    }
+
+    @Override
+    public boolean isBinderAlive() {
+        return false;
+    }
+
+    @Override
+    public IInterface queryLocalInterface(String descriptor) {
+        return null;
+    }
+
+    @Override
+    public void dump(FileDescriptor fd, String[] args) throws RemoteException {}
+
+    @Override
+    public void dumpAsync(FileDescriptor fd, String[] args) throws RemoteException {}
+
+    @Override
+    public boolean transact(int code, Parcel data, Parcel reply, int flags) throws RemoteException {
+        return false;
+    }
+
+    @Override
+    public void linkToDeath(DeathRecipient recipient, int flags) throws RemoteException {}
+
+    @Override
+    public boolean unlinkToDeath(DeathRecipient recipient, int flags) {
+        return false;
+    }
+}
diff --git a/framework-t/Android.bp b/framework-t/Android.bp
index a6700e5..77f5b21 100644
--- a/framework-t/Android.bp
+++ b/framework-t/Android.bp
@@ -21,7 +21,7 @@
 
 java_defaults {
     name: "enable-framework-connectivity-t-targets",
-    enabled: true,
+    enabled: false,
 }
 // The above defaults can be used to disable framework-connectivity t
 // targets while minimizing merge conflicts in the build rules.
diff --git a/service/Android.bp b/service/Android.bp
index 6d187ba..95b1758 100644
--- a/service/Android.bp
+++ b/service/Android.bp
@@ -116,7 +116,7 @@
         "networkstack-client",
         "PlatformProperties",
         "service-connectivity-protos",
-        "NetworkStackApiCurrentShims",
+        "NetworkStackApiStableShims",
     ],
     apex_available: [
         "com.android.tethering",
diff --git a/tests/deflake/Android.bp b/tests/deflake/Android.bp
index 8205f1c..b3d0363 100644
--- a/tests/deflake/Android.bp
+++ b/tests/deflake/Android.bp
@@ -21,7 +21,7 @@
 
 // FrameworksNetDeflakeTest depends on FrameworksNetTests so it should be disabled
 // if FrameworksNetTests is disabled.
-enable_frameworks_net_deflake_test = true
+enable_frameworks_net_deflake_test = false
 // Placeholder
 // This is a placeholder comment to minimize merge conflicts, as enable_frameworks_net_deflake_test
 // may have different values depending on the branch
diff --git a/tests/unit/Android.bp b/tests/unit/Android.bp
index 25b391a..fe0210c 100644
--- a/tests/unit/Android.bp
+++ b/tests/unit/Android.bp
@@ -13,7 +13,7 @@
 // Whether to enable the FrameworksNetTests. Set to false in the branches that might have older
 // frameworks/base since FrameworksNetTests includes the test for classes that are not in
 // connectivity module.
-enable_frameworks_net_tests = true
+enable_frameworks_net_tests = false
 // Placeholder
 // This is a placeholder comment to minimize merge conflicts, as enable_frameworks_net_tests
 // may have different values depending on the branch
diff --git a/tests/unit/java/com/android/server/connectivity/VpnTest.java b/tests/unit/java/com/android/server/connectivity/VpnTest.java
index fd9aefa..33c0868 100644
--- a/tests/unit/java/com/android/server/connectivity/VpnTest.java
+++ b/tests/unit/java/com/android/server/connectivity/VpnTest.java
@@ -17,6 +17,9 @@
 package com.android.server.connectivity;
 
 import static android.Manifest.permission.BIND_VPN_SERVICE;
+import static android.Manifest.permission.CONTROL_VPN;
+import static android.content.pm.PackageManager.PERMISSION_DENIED;
+import static android.content.pm.PackageManager.PERMISSION_GRANTED;
 import static android.content.pm.UserInfo.FLAG_ADMIN;
 import static android.content.pm.UserInfo.FLAG_MANAGED_PROFILE;
 import static android.content.pm.UserInfo.FLAG_PRIMARY;
@@ -26,6 +29,9 @@
 import static android.net.INetd.IF_STATE_UP;
 import static android.os.UserHandle.PER_USER_RANGE;
 
+import static com.android.modules.utils.build.SdkLevel.isAtLeastT;
+import static com.android.testutils.MiscAsserts.assertThrows;
+
 import static org.junit.Assert.assertArrayEquals;
 import static org.junit.Assert.assertEquals;
 import static org.junit.Assert.assertFalse;
@@ -259,6 +265,10 @@
                         IpSecManager.Status.OK, TEST_TUNNEL_RESOURCE_ID, TEST_IFACE_NAME);
         when(mIpSecService.createTunnelInterface(any(), any(), any(), any(), any()))
                 .thenReturn(tunnelResp);
+        // The unit test should know what kind of permission it needs and set the permission by
+        // itself, so set the default value of Context#checkCallingOrSelfPermission to
+        // PERMISSION_DENIED.
+        doReturn(PERMISSION_DENIED).when(mContext).checkCallingOrSelfPermission(any());
     }
 
     private <T> void mockService(Class<T> clazz, String name, T service) {
@@ -511,6 +521,7 @@
 
     @Test
     public void testLockdownRuleReversibility() throws Exception {
+        doReturn(PERMISSION_GRANTED).when(mContext).checkCallingOrSelfPermission(CONTROL_VPN);
         final Vpn vpn = createVpn(primaryUser.id);
         final UidRangeParcel[] entireUser = {
             new UidRangeParcel(PRI_USER_RANGE.getLower(), PRI_USER_RANGE.getUpper())
@@ -538,6 +549,27 @@
     }
 
     @Test
+    public void testPrepare_throwSecurityExceptionWhenGivenPackageDoesNotBelongToTheCaller()
+            throws Exception {
+        assumeTrue(isAtLeastT());
+        final Vpn vpn = createVpnAndSetupUidChecks();
+        assertThrows(SecurityException.class,
+                () -> vpn.prepare("com.not.vpn.owner", null, VpnManager.TYPE_VPN_SERVICE));
+        assertThrows(SecurityException.class,
+                () -> vpn.prepare(null, "com.not.vpn.owner", VpnManager.TYPE_VPN_SERVICE));
+        assertThrows(SecurityException.class,
+                () -> vpn.prepare("com.not.vpn.owner1", "com.not.vpn.owner2",
+                        VpnManager.TYPE_VPN_SERVICE));
+    }
+
+    @Test
+    public void testPrepare_bothOldPackageAndNewPackageAreNull() throws Exception {
+        final Vpn vpn = createVpnAndSetupUidChecks();
+        assertTrue(vpn.prepare(null, null, VpnManager.TYPE_VPN_SERVICE));
+
+    }
+
+    @Test
     public void testIsAlwaysOnPackageSupported() throws Exception {
         final Vpn vpn = createVpn(primaryUser.id);