diff --git a/GPClient/enhancedwebview.cpp b/GPClient/enhancedwebview.cpp
index 12e4746..292c6ff 100644
--- a/GPClient/enhancedwebview.cpp
+++ b/GPClient/enhancedwebview.cpp
@@ -20,7 +20,6 @@ EnhancedWebView::~EnhancedWebView()
 void EnhancedWebView::initialize()
 {
     QString port = QProcessEnvironment::systemEnvironment().value(ENV_CDP_PORT);
-    qDebug() << "port:" << port;
     cdp->initialize("http://127.0.0.1:" + port + "/json");
 }
 
diff --git a/GPClient/gpclient.cpp b/GPClient/gpclient.cpp
index 7f61b2b..a5b81d7 100644
--- a/GPClient/gpclient.cpp
+++ b/GPClient/gpclient.cpp
@@ -28,21 +28,13 @@ GPClient::GPClient(QWidget *parent)
     // QNetworkAccessManager setup
     networkManager = new QNetworkAccessManager(this);
 
-    // Login window setup
-    loginWindow = new SAMLLoginWindow(this);
-    QObject::connect(loginWindow, &SAMLLoginWindow::success, this, &GPClient::onLoginSuccess);
-    QObject::connect(loginWindow, &SAMLLoginWindow::rejected, this, &GPClient::connectFailed);
-
     // DBus service setup
     vpn = new com::yuezk::qt::GPService("com.yuezk.qt.GPService", "/", QDBusConnection::systemBus(), this);
     QObject::connect(vpn, &com::yuezk::qt::GPService::connected, this, &GPClient::onVPNConnected);
     QObject::connect(vpn, &com::yuezk::qt::GPService::disconnected, this, &GPClient::onVPNDisconnected);
     QObject::connect(vpn, &com::yuezk::qt::GPService::logAvailable, this, &GPClient::onVPNLogAvailable);
 
-    int status = vpn->status();
-    if (status != 0) {
-        updateConnectionStatus("connected");
-    }
+    initVpnStatus();
 }
 
 GPClient::~GPClient()
@@ -50,7 +42,6 @@ GPClient::~GPClient()
     delete ui;
     delete networkManager;
     delete reply;
-    delete loginWindow;
     delete vpn;
     delete settings;
 }
@@ -64,7 +55,7 @@ void GPClient::on_connectButton_clicked()
         settings->setValue("portal", portal);
         ui->statusLabel->setText("Authenticating...");
         updateConnectionStatus("pending");
-        samlLogin(portal);
+        doAuth(portal);
     } else if (btnText == "Cancel") {
         ui->statusLabel->setText("Canceling...");
         updateConnectionStatus("pending");
@@ -83,7 +74,7 @@ void GPClient::on_connectButton_clicked()
 void GPClient::preloginResultFinished()
 {
     if (reply->error()) {
-        qDebug() << "request error";
+        qDebug() << "Prelogin request error";
         emit connectFailed();
         return;
     }
@@ -109,20 +100,18 @@ void GPClient::preloginResultFinished()
     }
 
     if (samlMethod == nullptr || samlRequest == nullptr) {
-        qCritical("This does not appear to be a SAML prelogin response (<saml-auth-method> or <saml-request> tags missing)");
+        qDebug("This does not appear to be a SAML prelogin response (<saml-auth-method> or <saml-request> tags missing)");
         emit connectFailed();
         return;
     }
 
     if (samlMethod == "POST") {
         // TODO
-        qInfo("TODO: SAML method is POST");
+        qDebug("TODO: SAML method is POST");
         emit connectFailed();
     } else if (samlMethod == "REDIRECT") {
         qInfo() << "Request URL is: %s" << samlRequest;
-
-        loginWindow->login(samlRequest);
-        loginWindow->exec();
+        samlLogin(samlRequest);
     }
 }
 
@@ -177,6 +166,7 @@ void GPClient::onVPNConnected()
 
 void GPClient::onVPNDisconnected()
 {
+    qDebug("========= disconnected");
     updateConnectionStatus("not_connected");
 }
 
@@ -185,6 +175,20 @@ void GPClient::onVPNLogAvailable(QString log)
     qDebug() << log;
 }
 
+void GPClient::initVpnStatus() {
+    int status = vpn->status();
+    qDebug() << "VPN status:" << status;
+    if (status == 1) {
+        ui->statusLabel->setText("Connecting...");
+        updateConnectionStatus("pending");
+    } else if (status == 2) {
+        updateConnectionStatus("connected");
+    } else if (status == 3) {
+        ui->statusLabel->setText("Disconnecting...");
+        updateConnectionStatus("pending");
+    }
+}
+
 void GPClient::moveCenter()
 {
     QDesktopWidget *desktop = QApplication::desktop();
@@ -207,7 +211,7 @@ void GPClient::moveCenter()
     move(x, y);
 }
 
-void GPClient::samlLogin(const QString portal)
+void GPClient::doAuth(const QString portal)
 {
     const QString preloginUrl = "https://" + portal + "/ssl-vpn/prelogin.esp";
     qDebug("%s", preloginUrl.toStdString().c_str());
@@ -215,3 +219,15 @@ void GPClient::samlLogin(const QString portal)
     reply = networkManager->post(QNetworkRequest(preloginUrl), (QByteArray) nullptr);
     connect(reply, &QNetworkReply::finished, this, &GPClient::preloginResultFinished);
 }
+
+void GPClient::samlLogin(const QString loginUrl)
+{
+    SAMLLoginWindow *loginWindow = new SAMLLoginWindow(this);
+
+    QObject::connect(loginWindow, &SAMLLoginWindow::success, this, &GPClient::onLoginSuccess);
+    QObject::connect(loginWindow, &SAMLLoginWindow::rejected, this, &GPClient::connectFailed);
+
+    loginWindow->login(loginUrl);
+    loginWindow->exec();
+    delete loginWindow;
+}
diff --git a/GPClient/gpclient.h b/GPClient/gpclient.h
index d8f79d0..1d5b986 100644
--- a/GPClient/gpclient.h
+++ b/GPClient/gpclient.h
@@ -2,7 +2,6 @@
 #define GPCLIENT_H
 
 #include "gpservice_interface.h"
-#include "samlloginwindow.h"
 #include <QMainWindow>
 #include <QNetworkAccessManager>
 #include <QNetworkReply>
@@ -34,14 +33,15 @@ private slots:
 
 private:
     Ui::GPClient *ui;
-    SAMLLoginWindow *loginWindow;
     QNetworkAccessManager *networkManager;
     QNetworkReply *reply;
     com::yuezk::qt::GPService *vpn;
     QSettings *settings;
 
+    void initVpnStatus();
     void moveCenter();
     void updateConnectionStatus(QString status);
-    void samlLogin(const QString portal);
+    void doAuth(const QString portal);
+    void samlLogin(const QString loginUrl);
 };
 #endif // GPCLIENT_H
diff --git a/GPService/gpservice.cpp b/GPService/gpservice.cpp
index b9090a6..2beb967 100644
--- a/GPService/gpservice.cpp
+++ b/GPService/gpservice.cpp
@@ -51,8 +51,8 @@ void GPService::quit()
 
 void GPService::connect(QString server, QString username, QString passwd)
 {
-    if (status() != QProcess::NotRunning) {
-        log("Openconnect has already started on PID " + QString::number(openconnect->processId()) + ", nothing changed.");
+    if (vpnStatus != GPService::VpnNotConnected) {
+        log("VPN status is: " + QVariant::fromValue(vpnStatus).toString());
         return;
     }
 
@@ -67,6 +67,7 @@ void GPService::connect(QString server, QString username, QString passwd)
      << "--protocol=gp"
      << "-u" << username
      << "--passwd-on-stdin"
+     << "--timestamp"
      << server;
 
     openconnect->start(bin, args);
@@ -77,23 +78,26 @@ void GPService::connect(QString server, QString username, QString passwd)
 void GPService::disconnect()
 {
     if (openconnect->state() != QProcess::NotRunning) {
+        vpnStatus = GPService::VpnDisconnecting;
         openconnect->terminate();
     }
 }
 
 int GPService::status()
 {
-    return openconnect->state();
+    return vpnStatus;
 }
 
 void GPService::onProcessStarted()
 {
     log("Openconnect started successfully, PID=" + QString::number(openconnect->processId()));
+    vpnStatus = GPService::VpnConnecting;
 }
 
 void GPService::onProcessError(QProcess::ProcessError error)
 {
     log("Error occurred: " + QVariant::fromValue(error).toString());
+    vpnStatus = GPService::VpnNotConnected;
     emit disconnected();
 }
 
@@ -102,7 +106,8 @@ void GPService::onProcessStdout()
     QString output = openconnect->readAllStandardOutput();
 
     log(output);
-    if (output.startsWith("Connected as")) {
+    if (output.indexOf("Connected as") >= 0) {
+        vpnStatus = GPService::VpnConnected;
         emit connected();
     }
 }
@@ -115,6 +120,7 @@ void GPService::onProcessStderr()
 void GPService::onProcessFinished(int exitCode, QProcess::ExitStatus exitStatus)
 {
     log("Openconnect process exited with code " + QString::number(exitCode) + " and exit status " + QVariant::fromValue(exitStatus).toString());
+    vpnStatus = GPService::VpnNotConnected;
     emit disconnected();
 
     if (aboutToQuit) {
@@ -124,8 +130,6 @@ void GPService::onProcessFinished(int exitCode, QProcess::ExitStatus exitStatus)
 
 void GPService::log(QString msg)
 {
-    // 2020-02-12 15:33:45.120: log messsage
-    QString record = QDateTime::currentDateTime().toString("yyyy-MM-dd hh:mm:ss.zzz") + ": " + msg;
-    qDebug() << record;
-    emit logAvailable(record);
+    qDebug() << msg;
+    emit logAvailable(msg);
 }
diff --git a/GPService/gpservice.h b/GPService/gpservice.h
index 9a206cc..b8b8f98 100644
--- a/GPService/gpservice.h
+++ b/GPService/gpservice.h
@@ -21,6 +21,13 @@ public:
     explicit GPService(QObject *parent = nullptr);
     ~GPService();
 
+    enum VpnStatus {
+        VpnNotConnected,
+        VpnConnecting,
+        VpnConnected,
+        VpnDisconnecting,
+    };
+
 signals:
     void connected();
     void disconnected();
@@ -42,6 +49,7 @@ private slots:
 private:
     QProcess *openconnect;
     bool aboutToQuit = false;
+    int vpnStatus = GPService::VpnNotConnected;
 
     void log(QString msg);
     static QString findBinary();