diff --git a/sys/ExternalProcess.cpp b/sys/ExternalProcess.cpp
index 2b00f35..d05065f 100644
--- a/sys/ExternalProcess.cpp
+++ b/sys/ExternalProcess.cpp
@@ -141,15 +141,6 @@ namespace NekoGui_sys {
 
     void CoreProcess::Start() {
         show_stderr = false;
-        // set extra env
-        auto v2ray_asset_dir = NekoGui::FindCoreAsset("geoip.dat");
-        if (!v2ray_asset_dir.isEmpty()) {
-            v2ray_asset_dir = QFileInfo(v2ray_asset_dir).absolutePath();
-            env << "XRAY_LOCATION_ASSET=" + v2ray_asset_dir;
-        }
-        if (NekoGui::dataStore->core_ray_direct_dns) env << "NKR_CORE_RAY_DIRECT_DNS=1";
-        if (NekoGui::dataStore->core_ray_windows_disable_auto_interface) env << "NKR_CORE_RAY_WINDOWS_DISABLE_AUTO_INTERFACE=1";
-        //
         ExternalProcess::Start();
         write((NekoGui::dataStore->core_token + "\n").toUtf8());
     }
diff --git a/ui/mainwindow_grpc.cpp b/ui/mainwindow_grpc.cpp
index 64339dc..240baf3 100644
--- a/ui/mainwindow_grpc.cpp
+++ b/ui/mainwindow_grpc.cpp
@@ -304,10 +304,21 @@ void MainWindow::neko_start(int _id) {
         //
         bool rpcOK;
         QString error = defaultClient->Start(&rpcOK, req);
-        if (rpcOK && !error.isEmpty()) {
-            runOnUiThread([=] { MessageBoxWarning("LoadConfig return error", error); });
+        if (!rpcOK) {
             return false;
-        } else if (!rpcOK) {
+        }
+        if (!error.isEmpty()) {
+            if (error.contains("configure tun interface")) {
+                auto r = QMessageBox::information(this, tr("Tun device misbehaving"),
+                                                  tr("If you have trouble starting VPN, you can force reset nekobox_core process here and then try starting the profile again."),
+                                                  tr("Reset"), tr("Cancel"), "",
+                                                  1, 1);
+                if (r == 0) {
+                    GetMainWindow()->StopVPNProcess(true);
+                }
+                return false;
+            }
+            runOnUiThread([=] { MessageBoxWarning("LoadConfig return error", error); });
             return false;
         }
         //