diff --git a/project/Build.scala b/project/Build.scala
index 758d03b2..d0fe8b6c 100644
--- a/project/Build.scala
+++ b/project/Build.scala
@@ -5,8 +5,8 @@ import org.scalasbt.androidplugin._
 import org.scalasbt.androidplugin.AndroidKeys._
 
 object App {
-  val version = "1.4.1"
-  val versionCode = 23
+  val version = "1.4.2"
+  val versionCode = 24
 }
 
 object General {
diff --git a/src/main/scala/com/github/shadowsocks/ShadowVpnService.scala b/src/main/scala/com/github/shadowsocks/ShadowVpnService.scala
index df3dabda..01095025 100644
--- a/src/main/scala/com/github/shadowsocks/ShadowVpnService.scala
+++ b/src/main/scala/com/github/shadowsocks/ShadowVpnService.scala
@@ -37,12 +37,8 @@
  */
 package com.github.shadowsocks
 
-import android.app.Notification
-import android.app.PendingIntent
-import android.app.Service
-import android.content.Context
-import android.content.Intent
-import android.content.SharedPreferences
+import android.app.{NotificationManager, Notification, PendingIntent, Service}
+import android.content._
 import android.content.pm.PackageInfo
 import android.content.pm.PackageManager
 import android.os._
@@ -222,7 +218,6 @@ class ShadowVpnService extends VpnService {
         }
 
         if (resolved && handleConnection) {
-          notifyAlert(getString(R.string.forward_success), getString(R.string.service_running))
           handler.sendEmptyMessageDelayed(MSG_CONNECT_SUCCESS, 500)
         } else {
           notifyAlert(getString(R.string.forward_fail), getString(R.string.service_failed))
@@ -340,10 +335,13 @@ class ShadowVpnService extends VpnService {
     val openIntent: Intent = new Intent(this, classOf[Shadowsocks])
     openIntent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP)
     val contentIntent: PendingIntent = PendingIntent.getActivity(this, 0, openIntent, 0)
-    val closeIntent: Intent = new Intent(Utils.CLOSE_ACTION)
-    val actionIntent: PendingIntent = PendingIntent.getBroadcast(this, 0, closeIntent, 0)
     val builder: NotificationCompat.Builder = new NotificationCompat.Builder(this)
-    builder.setSmallIcon(R.drawable.ic_stat_shadowsocks).setWhen(0).setTicker(title).setContentTitle(getString(R.string.app_name)).setContentText(info).setContentIntent(contentIntent).addAction(android.R.drawable.ic_menu_close_clear_cancel, getString(R.string.stop), actionIntent)
+    builder
+      .setSmallIcon(R.drawable.ic_stat_shadowsocks).setWhen(0)
+      .setTicker(title).setContentTitle(getString(R.string.app_name))
+      .setContentText(info).setContentIntent(contentIntent)
+      .setAutoCancel(true)
+    notificationManager.notify(1, builder.build)
   }
 
   override def onBind(intent: Intent): IBinder = {
@@ -358,11 +356,20 @@ class ShadowVpnService extends VpnService {
     super.onCreate()
     EasyTracker.getTracker.sendEvent("service", "start", getVersionName, 0L)
     settings = PreferenceManager.getDefaultSharedPreferences(this)
+
+    notificationManager = getSystemService(Context.NOTIFICATION_SERVICE).asInstanceOf[NotificationManager]
+
+    // register close receiver
+    val filter = new IntentFilter()
+    filter.addAction(Intent.ACTION_SHUTDOWN)
+    filter.addAction(Utils.CLOSE_ACTION)
+    receiver = new CloseReceiver
+    registerReceiver(receiver, filter)
   }
 
-  /** Called when the activity is closed. */
-  override def onDestroy() {
+  def destroy() {
     EasyTracker.getTracker.sendEvent("service", "stop", getVersionName, 0L)
+    if (receiver != null) unregisterReceiver(receiver)
     new Thread {
       override def run() {
         onDisconnect()
@@ -376,21 +383,27 @@ class ShadowVpnService extends VpnService {
       conn.close()
       conn = null
     }
-    super.onDestroy()
     markServiceStopped()
   }
 
+  /** Called when the activity is closed. */
+  override def onDestroy() {
+    destroy()
+    super.onDestroy()
+  }
+
   def onDisconnect() {
-    Utils.runRootCommand(Utils.getIptables + " -t nat -F OUTPUT")
     val sb = new StringBuilder
-    sb.append("kill -9 `cat /data/data/com.github.shadowsocks/redsocks.pid`").append("\n")
+    if (!waitForProcess("redsocks")) {
+      sb.append("kill -9 `cat /data/data/com.github.shadowsocks/redsocks.pid`").append("\n")
+    }
     if (!waitForProcess("shadowsocks")) {
       sb.append("kill -9 `cat /data/data/com.github.shadowsocks/shadowsocks.pid`").append("\n")
     }
     if (!waitForProcess("tun2socks")) {
       sb.append("kill -9 `cat /data/data/com.github.shadowsocks/tun2socks.pid`").append("\n")
     }
-    Utils.runRootCommand(sb.toString())
+    Utils.runCommand(sb.toString())
   }
 
   override def onStart(intent: Intent, startId: Int) {
@@ -406,6 +419,13 @@ class ShadowVpnService extends VpnService {
     stopSelf()
   }
 
+  class CloseReceiver extends BroadcastReceiver {
+    def onReceive(p1: Context, p2: Intent) {
+      destroy()
+      stopSelf()
+    }
+  }
+
   val handler: Handler = new Handler {
     override def handleMessage(msg: Message) {
       val ed: SharedPreferences.Editor = settings.edit
@@ -428,6 +448,9 @@ class ShadowVpnService extends VpnService {
       super.handleMessage(msg)
     }
   }
+
+  var notificationManager: NotificationManager = null
+  var receiver: CloseReceiver = null
   var appHost: String = null
   var remotePort: Int = 0
   var localPort: Int = 0
diff --git a/src/main/scala/com/github/shadowsocks/Shadowsocks.scala b/src/main/scala/com/github/shadowsocks/Shadowsocks.scala
index c9aa1697..100508f2 100644
--- a/src/main/scala/com/github/shadowsocks/Shadowsocks.scala
+++ b/src/main/scala/com/github/shadowsocks/Shadowsocks.scala
@@ -110,14 +110,15 @@ object Shadowsocks {
     private def setPreferenceEnabled() {
       val settings: SharedPreferences = PreferenceManager.getDefaultSharedPreferences(getActivity)
       val enabled: Boolean = !settings.getBoolean("isRunning", false) && !settings.getBoolean("isConnecting", false)
-      for (name <- FEATRUE_PREFS) {
+      for (name <- Shadowsocks.FEATRUE_PREFS) {
         val pref: Preference = findPreference(name)
         if (pref != null) {
           if ((name == "isBypassApps") || (name == "proxyedApps")) {
             val isGlobalProxy: Boolean = settings.getBoolean("isGlobalProxy", false)
             pref.setEnabled(enabled && !isGlobalProxy)
-          }
-          else {
+          } else if (name == "isAutoConnect") {
+            pref.setEnabled(Utils.getRoot)
+          } else {
             pref.setEnabled(enabled)
           }
         }
@@ -411,8 +412,9 @@ class Shadowsocks extends UnifiedSherlockPreferenceActivity with CompoundButton.
         if ((name == "isBypassApps") || (name == "proxyedApps")) {
           val isGlobalProxy: Boolean = settings.getBoolean("isGlobalProxy", false)
           pref.setEnabled(enabled && !isGlobalProxy)
-        }
-        else {
+        } else if (name == "isAutoConnect") {
+          pref.setEnabled(Utils.getRoot)
+        } else {
           pref.setEnabled(enabled)
         }
       }
@@ -531,7 +533,7 @@ class Shadowsocks extends UnifiedSherlockPreferenceActivity with CompoundButton.
       stopService(new Intent(this, classOf[ShadowVpnService]))
     }
     if (ShadowsocksService.isServiceStarted) {
-      stopService(new Intent(this, classOf[ShadowsocksService]))
+      sendBroadcast(new Intent(Utils.CLOSE_ACTION))
     }
   }
 
diff --git a/src/main/scala/com/github/shadowsocks/ShadowsocksReceiver.scala b/src/main/scala/com/github/shadowsocks/ShadowsocksReceiver.scala
index 03e05c6c..40ecd5f8 100644
--- a/src/main/scala/com/github/shadowsocks/ShadowsocksReceiver.scala
+++ b/src/main/scala/com/github/shadowsocks/ShadowsocksReceiver.scala
@@ -90,11 +90,8 @@ class ShadowsocksReceiver extends BroadcastReceiver {
         if (ShadowsocksService.isServiceStarted) return
         val it: Intent = new Intent(context, classOf[ShadowsocksService])
         context.startService(it)
-      } else {
-        if (ShadowVpnService.isServiceStarted) return
-        val it: Intent = new Intent(context, classOf[ShadowVpnService])
-        context.startService(it)
       }
+
     }
   }
 }
\ No newline at end of file
diff --git a/src/main/scala/com/github/shadowsocks/ShadowsocksService.scala b/src/main/scala/com/github/shadowsocks/ShadowsocksService.scala
index 6616d6cd..afb2aab3 100644
--- a/src/main/scala/com/github/shadowsocks/ShadowsocksService.scala
+++ b/src/main/scala/com/github/shadowsocks/ShadowsocksService.scala
@@ -61,9 +61,6 @@ import java.io.IOException
 import java.lang.ref.WeakReference
 import java.lang.reflect.InvocationTargetException
 import java.lang.reflect.Method
-import java.net.Inet6Address
-import java.net.InetAddress
-import java.net.UnknownHostException
 import org.apache.http.conn.util.InetAddressUtils
 import scala.collection._
 import org.xbill.DNS._
@@ -243,7 +240,7 @@ class ShadowsocksService extends Service {
         Log.d(TAG, "IPTABLES: " + Utils.getIptables)
         hasRedirectSupport = Utils.getHasRedirectSupport
         if (resolved && handleConnection) {
-          notifyAlert(getString(R.string.forward_success), getString(R.string.service_running))
+          notifyForegroundAlert(getString(R.string.forward_success), getString(R.string.service_running))
           handler.sendEmptyMessageDelayed(MSG_CONNECT_SUCCESS, 500)
         }
         else {
@@ -323,17 +320,35 @@ class ShadowsocksService extends Service {
     ShadowsocksService.sRunningInstance = null
   }
 
-  def notifyAlert(title: String, info: String) {
+  def notifyForegroundAlert(title: String, info: String) {
     val openIntent: Intent = new Intent(this, classOf[Shadowsocks])
     openIntent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP)
     val contentIntent: PendingIntent = PendingIntent.getActivity(this, 0, openIntent, 0)
     val closeIntent: Intent = new Intent(Utils.CLOSE_ACTION)
     val actionIntent: PendingIntent = PendingIntent.getBroadcast(this, 0, closeIntent, 0)
     val builder: NotificationCompat.Builder = new NotificationCompat.Builder(this)
-    builder.setSmallIcon(R.drawable.ic_stat_shadowsocks).setWhen(0).setTicker(title).setContentTitle(getString(R.string.app_name)).setContentText(info).setContentIntent(contentIntent).addAction(android.R.drawable.ic_menu_close_clear_cancel, getString(R.string.stop), actionIntent)
+    builder
+      .setSmallIcon(R.drawable.ic_stat_shadowsocks).setWhen(0)
+      .setTicker(title).setContentTitle(getString(R.string.app_name))
+      .setContentText(info).setContentIntent(contentIntent)
+      .addAction(android.R.drawable.ic_menu_close_clear_cancel, getString(R.string.stop), actionIntent)
     startForegroundCompat(1, builder.build)
   }
 
+  def notifyAlert(title: String, info: String) {
+    val openIntent: Intent = new Intent(this, classOf[Shadowsocks])
+    openIntent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP)
+    val contentIntent: PendingIntent = PendingIntent.getActivity(this, 0, openIntent, 0)
+    val builder: NotificationCompat.Builder = new NotificationCompat.Builder(this)
+    builder
+      .setSmallIcon(R.drawable.ic_stat_shadowsocks).setWhen(0)
+      .setTicker(title)
+      .setContentTitle(getString(R.string.app_name))
+      .setContentText(info).setContentIntent(contentIntent)
+      .setAutoCancel(true)
+    notificationManager.notify(1, builder.build)
+  }
+
   def onBind(intent: Intent): IBinder = {
     null
   }
@@ -378,15 +393,8 @@ class ShadowsocksService extends Service {
     ed.putBoolean("isRunning", false)
     ed.putBoolean("isConnecting", false)
     ed.commit
-    try {
-      notificationManager.cancel(0)
-    }
-    catch {
-      case ignore: Exception => {
-      }
-    }
-    super.onDestroy()
     markServiceStopped()
+    super.onDestroy()
   }
 
   def onDisconnect() {