diff --git a/Android/doric/src/main/java/pub/doric/dev/DevPanel.java b/Android/doric/src/main/java/pub/doric/dev/DevPanel.java
index 416de906..563e1b22 100644
--- a/Android/doric/src/main/java/pub/doric/dev/DevPanel.java
+++ b/Android/doric/src/main/java/pub/doric/dev/DevPanel.java
@@ -7,6 +7,7 @@ import android.os.Bundle;
 import android.view.LayoutInflater;
 import android.view.View;
 import android.view.ViewGroup;
+import android.widget.Toast;
 
 import androidx.annotation.NonNull;
 import androidx.annotation.Nullable;
@@ -28,7 +29,8 @@ import pub.doric.Doric;
 import pub.doric.DoricContext;
 import pub.doric.DoricContextManager;
 import pub.doric.R;
-import pub.doric.dev.event.EOFEvent;
+import pub.doric.dev.event.ConnectExceptionEvent;
+import pub.doric.dev.event.EOFExceptionEvent;
 import pub.doric.dev.event.OpenEvent;
 
 public class DevPanel extends BottomSheetDialogFragment {
@@ -113,11 +115,19 @@ public class DevPanel extends BottomSheetDialogFragment {
     @Subscribe(threadMode = ThreadMode.MAIN)
     public void onOpenEvent(OpenEvent openEvent) {
         updateUI();
+        Toast.makeText(getContext(), "dev kit connected", Toast.LENGTH_LONG).show();
     }
 
     @Subscribe(threadMode = ThreadMode.MAIN)
-    public void onEOFEvent(EOFEvent eofEvent) {
+    public void onEOFEvent(EOFExceptionEvent eofExceptionEvent) {
         updateUI();
+        Toast.makeText(getContext(), "dev kit eof exception", Toast.LENGTH_LONG).show();
+    }
+
+    @Subscribe(threadMode = ThreadMode.MAIN)
+    public void onConnectExceptionEvent(ConnectExceptionEvent connectExceptionEvent) {
+        updateUI();
+        Toast.makeText(getContext(), "dev kit connection exception", Toast.LENGTH_LONG).show();
     }
 
     private void updateUI() {
diff --git a/Android/doric/src/main/java/pub/doric/dev/WSClient.java b/Android/doric/src/main/java/pub/doric/dev/WSClient.java
index 9b2d4143..cf05d8ed 100644
--- a/Android/doric/src/main/java/pub/doric/dev/WSClient.java
+++ b/Android/doric/src/main/java/pub/doric/dev/WSClient.java
@@ -20,6 +20,7 @@ import org.json.JSONException;
 import org.json.JSONObject;
 
 import java.io.EOFException;
+import java.net.ConnectException;
 import java.util.concurrent.TimeUnit;
 
 import okhttp3.OkHttpClient;
@@ -29,7 +30,8 @@ import okhttp3.WebSocket;
 import okhttp3.WebSocketListener;
 import pub.doric.DoricContext;
 import pub.doric.DoricContextManager;
-import pub.doric.dev.event.EOFEvent;
+import pub.doric.dev.event.ConnectExceptionEvent;
+import pub.doric.dev.event.EOFExceptionEvent;
 import pub.doric.dev.event.EnterDebugEvent;
 import pub.doric.dev.event.OpenEvent;
 
@@ -108,7 +110,10 @@ public class WSClient extends WebSocketListener {
 
         if (t instanceof EOFException) {
             DevPanel.isDevConnected = false;
-            EventBus.getDefault().post(new EOFEvent());
+            EventBus.getDefault().post(new EOFExceptionEvent());
+        } else if (t instanceof ConnectException) {
+            DevPanel.isDevConnected = false;
+            EventBus.getDefault().post(new ConnectExceptionEvent());
         }
     }
 
diff --git a/Android/doric/src/main/java/pub/doric/dev/event/ConnectExceptionEvent.java b/Android/doric/src/main/java/pub/doric/dev/event/ConnectExceptionEvent.java
new file mode 100644
index 00000000..945276ad
--- /dev/null
+++ b/Android/doric/src/main/java/pub/doric/dev/event/ConnectExceptionEvent.java
@@ -0,0 +1,4 @@
+package pub.doric.dev.event;
+
+public class ConnectExceptionEvent {
+}
diff --git a/Android/doric/src/main/java/pub/doric/dev/event/EOFEvent.java b/Android/doric/src/main/java/pub/doric/dev/event/EOFEvent.java
deleted file mode 100644
index aabb4931..00000000
--- a/Android/doric/src/main/java/pub/doric/dev/event/EOFEvent.java
+++ /dev/null
@@ -1,4 +0,0 @@
-package pub.doric.dev.event;
-
-public class EOFEvent {
-}
diff --git a/Android/doric/src/main/java/pub/doric/dev/event/EOFExceptionEvent.java b/Android/doric/src/main/java/pub/doric/dev/event/EOFExceptionEvent.java
new file mode 100644
index 00000000..376f0e62
--- /dev/null
+++ b/Android/doric/src/main/java/pub/doric/dev/event/EOFExceptionEvent.java
@@ -0,0 +1,4 @@
+package pub.doric.dev.event;
+
+public class EOFExceptionEvent {
+}