diff --git a/app/src/main/java/cx/myth/zjuconnect/MyVpnService.java b/app/src/main/java/cx/myth/zjuconnect/MyVpnService.java
index 4a9716c..4c7ef63 100644
--- a/app/src/main/java/cx/myth/zjuconnect/MyVpnService.java
+++ b/app/src/main/java/cx/myth/zjuconnect/MyVpnService.java
@@ -46,15 +46,21 @@ public int onStartCommand(Intent intent, int flags, int startId) {
 
             localBroadcastManager.sendBroadcast(new Intent("cx.myth.zjuconnect.LOGIN_SUCCEEDED"));
 
-            Builder builder = new Builder().addAddress(ip, 8).addRoute("10.0.0.0", 8).addDnsServer(dnsServer).setMtu(1400);
-            tun = builder.establish();
-
-            executors.submit(() -> {
-                Mobile.startStack(tun.getFd());
-                localBroadcastManager.sendBroadcast(new Intent("cx.myth.zjuconnect.STACK_STOPPED"));
-                stop();
+            try {
+                Builder builder = new Builder().addAddress(ip, 8).addRoute("10.0.0.0", 8).addDnsServer(dnsServer).setMtu(1400);
+                tun = builder.establish();
+
+                executors.submit(() -> {
+                    Mobile.startStack(tun.getFd());
+                    localBroadcastManager.sendBroadcast(new Intent("cx.myth.zjuconnect.STACK_STOPPED"));
+                    stop();
+                    stopSelf();
+                });
+            } catch (Exception e) {
+                e.printStackTrace();
+                localBroadcastManager.sendBroadcast(new Intent("cx.myth.zjuconnect.LOGIN_FAILED"));
                 stopSelf();
-            });
+            }
         }).start();
 
         return START_STICKY;