diff --git a/core/server/gen/libcore.proto b/core/server/gen/libcore.proto
index 4b74cba..fe242d3 100644
--- a/core/server/gen/libcore.proto
+++ b/core/server/gen/libcore.proto
@@ -5,8 +5,6 @@ option go_package = "grpc_server/gen";
 option optimize_for = LITE_RUNTIME;
 
 service LibcoreService {
-  rpc Exit(EmptyReq) returns (EmptyResp);
-  //
   rpc Start(LoadConfigReq) returns (ErrorResp);
   rpc Stop(EmptyReq) returns (ErrorResp);
   rpc CheckConfig(LoadConfigReq) returns (ErrorResp);
diff --git a/core/server/server.go b/core/server/server.go
index 3eaa452..e1c21cb 100644
--- a/core/server/server.go
+++ b/core/server/server.go
@@ -40,22 +40,6 @@ func To[T any](v T) *T {
 	return &v
 }
 
-func (s *server) Exit(ctx context.Context, in *gen.EmptyReq) (out *gen.EmptyResp, _ error) {
-	out = &gen.EmptyResp{}
-
-	if needUnsetDNS {
-		needUnsetDNS = false
-		err := sys.SetSystemDNS("Empty", boxInstance.Network().InterfaceMonitor())
-		if err != nil {
-			log.Println("Failed to unset system DNS:", err)
-		}
-	}
-
-	// Connection closed
-	defer os.Exit(0)
-	return
-}
-
 func (s *server) Start(ctx context.Context, in *gen.LoadConfigReq) (out *gen.ErrorResp, _ error) {
 	var err error
 
diff --git a/include/api/gRPC.h b/include/api/gRPC.h
index b79445a..043a85b 100644
--- a/include/api/gRPC.h
+++ b/include/api/gRPC.h
@@ -16,8 +16,6 @@ namespace API {
     public:
         explicit Client(std::function<void(const QString &)> onError, const QString &target);
 
-        void Exit();
-
         // QString returns is error string
 
         QString Start(bool *rpcOK, const libcore::LoadConfigReq &request);
diff --git a/src/api/gRPC.cpp b/src/api/gRPC.cpp
index 23b5def..8791ce2 100644
--- a/src/api/gRPC.cpp
+++ b/src/api/gRPC.cpp
@@ -188,13 +188,6 @@ namespace API {
     *rpcOK = false; \
     onError(QString("QNetworkReply::NetworkError code: %1\n").arg(status));
 
-    void Client::Exit() {
-        libcore::EmptyReq request;
-        libcore::EmptyResp reply;
-        std::vector<uint8_t> rsp;
-        default_grpc_channel->Call("Exit", spb::pb::serialize< std::string >( request ), rsp, 100);
-    }
-
     QString Client::Start(bool *rpcOK, const libcore::LoadConfigReq &request) {
         libcore::ErrorResp reply;
         std::vector<uint8_t> rsp;
diff --git a/src/ui/mainwindow.cpp b/src/ui/mainwindow.cpp
index 11f28a4..731a031 100644
--- a/src/ui/mainwindow.cpp
+++ b/src/ui/mainwindow.cpp
@@ -843,7 +843,7 @@ void MainWindow::prepare_exit()
     Configs::dataStore->save_control_no_save = true; // don't change datastore after this line
     profile_stop(false, true);
     sem_stopped.acquire();
-    API::defaultClient->Exit();
+    core_process->Kill();
     mu_exit.unlock();
     qDebug() << "prepare exit done!";
 }