diff --git a/apps/netlauncher/Main.cpp b/apps/netlauncher/Main.cpp
index 1ea53ed4f..57c16bb3d 100644
--- a/apps/netlauncher/Main.cpp
+++ b/apps/netlauncher/Main.cpp
@@ -26,8 +26,6 @@ Main::Main(QWidget *parent)
     tblServerBrowser->hideColumn(ServerData::ADDR);
     tblFavorites->hideColumn(ServerData::ADDR);
 
-    refresh();
-
     connect(tabWidget, SIGNAL(currentChanged(int)), this, SLOT(tabSwitched(int)));
     connect(actionAdd, SIGNAL(triggered(bool)), this, SLOT(addServer()));
     connect(actionAdd_by_IP, SIGNAL(triggered(bool)), this, SLOT(addServerByIP()));
@@ -81,9 +79,9 @@ void Main::deleteServer()
     }
 }
 
-void Main::refresh()
+bool Main::refresh()
 {
-    NetController::get()->updateInfo(proxyModel->sourceModel());
+    return NetController::get()->updateInfo(proxyModel->sourceModel());
     /*tblServerBrowser->resizeColumnToContents(ServerData::HOSTNAME);
     tblServerBrowser->resizeColumnToContents(ServerData::MODNAME);
     tblFavorites->resizeColumnToContents(ServerData::HOSTNAME);
diff --git a/apps/netlauncher/Main.hpp b/apps/netlauncher/Main.hpp
index 08c5d134e..e896d9a3e 100644
--- a/apps/netlauncher/Main.hpp
+++ b/apps/netlauncher/Main.hpp
@@ -18,12 +18,13 @@ public:
     explicit Main(QWidget *parent = 0);
     virtual ~Main();
 protected:
+public slots:
+    bool refresh();
 protected slots:
     void tabSwitched(int index);
     void addServer();
     void addServerByIP();
     void deleteServer();
-    void refresh();
     void play();
     void serverSelected();
 private:
diff --git a/apps/netlauncher/NetController.cpp b/apps/netlauncher/NetController.cpp
index 40f7a2da4..61d19458a 100644
--- a/apps/netlauncher/NetController.cpp
+++ b/apps/netlauncher/NetController.cpp
@@ -15,6 +15,7 @@
 #include <QJsonDocument>
 #include <QJsonArray>
 #include <memory>
+#include <QtWidgets/QMessageBox>
 
 using namespace std;
 
@@ -59,7 +60,7 @@ struct pattern
     QString value;
 };
 
-void NetController::downloadInfo(QAbstractItemModel *pModel, QModelIndex index)
+bool NetController::downloadInfo(QAbstractItemModel *pModel, QModelIndex index)
 {
     ServerModel *model = ((ServerModel *) pModel);
 
@@ -76,6 +77,12 @@ void NetController::downloadInfo(QAbstractItemModel *pModel, QModelIndex index)
         RakSleep(30);
     }
 
+    if(data == "UNKNOWN_ADDRESS")
+    {
+        QMessageBox::critical(0, "Error", "Cannot connect to the master server!");
+        return false;
+    }
+
     qDebug() << "Content: " << data;
 
     QJsonParseError err;
@@ -116,6 +123,7 @@ void NetController::downloadInfo(QAbstractItemModel *pModel, QModelIndex index)
         model->setData(mi, PingRakNetServer(addr[0].toLatin1().data(), addr[1].toUShort()));
     }
 
+    return true;
 }
 
 bool NetController::updateInfo(QAbstractItemModel *pModel, QModelIndex index)
@@ -137,8 +145,9 @@ bool NetController::updateInfo(QAbstractItemModel *pModel, QModelIndex index)
             qDebug() << iter->addr;
         }
         model->removeRows(0, model->rowCount(index));
-        downloadInfo(pModel, index);
+        result = downloadInfo(pModel, index);
     }
+    return result;
 }
 
 void NetController::updateInfo()
@@ -153,6 +162,12 @@ void NetController::updateInfo()
         RakSleep(30);
     }
 
+    if(data == "UNKNOWN_ADDRESS")
+    {
+        QMessageBox::critical(0, "Error", "Cannot connect to the master server!");
+        return;
+    }
+
     qDebug() << "Content: " << data;
 
     QJsonParseError err;
diff --git a/apps/netlauncher/NetController.hpp b/apps/netlauncher/NetController.hpp
index 93ea3f451..40d45fbb0 100644
--- a/apps/netlauncher/NetController.hpp
+++ b/apps/netlauncher/NetController.hpp
@@ -18,7 +18,7 @@ public:
     static NetController *get();
     static void Create(std::string addr, unsigned short port);
     static void Destroy();
-    void updateInfo(QAbstractItemModel *pModel, QModelIndex index= QModelIndex());
+    bool updateInfo(QAbstractItemModel *pModel, QModelIndex index= QModelIndex());
     void updateInfo();
     QStringList players();
     QStringList plugins();
@@ -29,7 +29,7 @@ protected:
     ~NetController();
 private:
     NetController(const NetController &controller);
-    void downloadInfo(QAbstractItemModel *pModel, QModelIndex index);
+    bool downloadInfo(QAbstractItemModel *pModel, QModelIndex index);
 
     static NetController *mThis;
     ServerData *sd;
diff --git a/apps/netlauncher/main.cpp b/apps/netlauncher/main.cpp
index 4caddc666..885ead8e6 100644
--- a/apps/netlauncher/main.cpp
+++ b/apps/netlauncher/main.cpp
@@ -44,7 +44,14 @@ int main(int argc, char *argv[])
     atexit(NetController::Destroy);
     QApplication app(argc, argv);
     Main d;
-    d.show();
-    // create and show your widgets here
-    return app.exec();
+    if (d.refresh())
+    {
+        d.show();
+        return app.exec();
+    }
+    else
+    {
+        app.exit();
+        return 0;
+    }
 }
\ No newline at end of file
diff --git a/apps/netlauncher/netutils/HTTPNetwork.cpp b/apps/netlauncher/netutils/HTTPNetwork.cpp
index c59b1f52a..b266e6acb 100644
--- a/apps/netlauncher/netutils/HTTPNetwork.cpp
+++ b/apps/netlauncher/netutils/HTTPNetwork.cpp
@@ -75,7 +75,8 @@ std::string HTTPNetwork::getData(const char *uri)
 {
     RakNet::RakString createRequest = RakNet::RakString::FormatForGET(uri);
 
-    httpConnection->TransmitRequest(createRequest, address.c_str(), port);
+    if (!httpConnection->TransmitRequest(createRequest, address.c_str(), port))
+        return "UNKNOWN_ADDRESS";
     return answer();
 }
 
@@ -83,7 +84,8 @@ std::string HTTPNetwork::getDataPOST(const char *uri, const char* body, const ch
 {
     RakNet::RakString createRequest = RakNet::RakString::FormatForPOST(uri, contentType, body);
 
-    httpConnection->TransmitRequest(createRequest, address.c_str(), port);
+    if (!httpConnection->TransmitRequest(createRequest, address.c_str(), port))
+        return "UNKNOWN_ADDRESS";
     return answer();
 }
 
@@ -91,6 +93,7 @@ std::string HTTPNetwork::getDataPUT(const char *uri, const char* body, const cha
 {
     RakNet::RakString createRequest = RakNet::RakString::FormatForPUT(uri, contentType, body);
 
-    httpConnection->TransmitRequest(createRequest, address.c_str(), port);
+    if (!httpConnection->TransmitRequest(createRequest, address.c_str(), port))
+        return "UNKNOWN_ADDRESS";
     return answer();
 }