diff --git a/src/ui/control/controlworker.cpp b/src/ui/control/controlworker.cpp
index 7fce01db..81b1bd84 100644
--- a/src/ui/control/controlworker.cpp
+++ b/src/ui/control/controlworker.cpp
@@ -78,6 +78,11 @@ int ControlWorker::id() const
     return int(socket()->socketDescriptor());
 }
 
+bool ControlWorker::isConnected() const
+{
+    return socket()->state() == QLocalSocket::ConnectedState;
+}
+
 QString ControlWorker::errorString() const
 {
     return socket()->errorString();
@@ -124,7 +129,11 @@ bool ControlWorker::sendCommandData(const QByteArray &commandData)
 
     const int bytesSent = socket()->write(commandData);
     if (bytesSent != commandData.size()) {
-        qWarning() << "Sent partial:" << id() << bytesSent << commandData.size();
+        if (bytesSent < 0) {
+            qWarning() << "Send error:" << id() << errorString();
+        } else {
+            qWarning() << "Sent partial:" << id() << bytesSent << commandData.size();
+        }
         return false;
     }
 
diff --git a/src/ui/control/controlworker.h b/src/ui/control/controlworker.h
index 9bf5c883..3acdd3e8 100644
--- a/src/ui/control/controlworker.h
+++ b/src/ui/control/controlworker.h
@@ -24,7 +24,7 @@ public:
     QLocalSocket *socket() const { return m_socket; }
 
     int id() const;
-
+    bool isConnected() const;
     QString errorString() const;
 
     void setupForAsync();
diff --git a/src/ui/driver/drivermanager.cpp b/src/ui/driver/drivermanager.cpp
index 0c6f170b..1d40037b 100644
--- a/src/ui/driver/drivermanager.cpp
+++ b/src/ui/driver/drivermanager.cpp
@@ -116,22 +116,22 @@ bool DriverManager::writeData(quint32 code, QByteArray &buf, int size)
     return res;
 }
 
-void DriverManager::reinstallDriver()
+bool DriverManager::reinstallDriver()
 {
-    executeCommand("reinstall.lnk");
+    return executeCommand("reinstall.lnk");
 }
 
-void DriverManager::uninstallDriver()
+bool DriverManager::uninstallDriver()
 {
-    executeCommand("uninstall.lnk");
+    return executeCommand("uninstall.lnk");
 }
 
-void DriverManager::executeCommand(const QString &fileName)
+bool DriverManager::executeCommand(const QString &fileName)
 {
     const QString binPath = FileUtil::toNativeSeparators(FileUtil::appBinLocation());
 
     const QString cmdPath = qEnvironmentVariable("COMSPEC");
     const QString scriptPath = binPath + R"(\driver\scripts\execute-cmd.bat)";
 
-    QProcess::execute(cmdPath, QStringList() << "/C" << scriptPath << fileName);
+    return QProcess::execute(cmdPath, QStringList() << "/C" << scriptPath << fileName) == 0;
 }
diff --git a/src/ui/driver/drivermanager.h b/src/ui/driver/drivermanager.h
index 474cda21..6d839e04 100644
--- a/src/ui/driver/drivermanager.h
+++ b/src/ui/driver/drivermanager.h
@@ -31,8 +31,8 @@ public:
 
     virtual void initialize();
 
-    virtual void reinstallDriver();
-    virtual void uninstallDriver();
+    virtual bool reinstallDriver();
+    virtual bool uninstallDriver();
 
 signals:
     void errorCodeChanged();
@@ -58,7 +58,7 @@ private:
 
     bool writeData(quint32 code, QByteArray &buf, int size);
 
-    static void executeCommand(const QString &fileName);
+    static bool executeCommand(const QString &fileName);
 
 private:
     quint32 m_errorCode = 0;
diff --git a/src/ui/fortmanager.cpp b/src/ui/fortmanager.cpp
index 20165f70..c24e5165 100644
--- a/src/ui/fortmanager.cpp
+++ b/src/ui/fortmanager.cpp
@@ -161,7 +161,7 @@ void FortManager::setupRpcManager()
     }
 }
 
-void FortManager::installDriver()
+bool FortManager::installDriver()
 {
     closeDriver();
 
@@ -170,13 +170,17 @@ void FortManager::installDriver()
     if (setupDriver()) {
         updateDriverConf();
     }
+
+    return true;
 }
 
-void FortManager::removeDriver()
+bool FortManager::removeDriver()
 {
     closeDriver();
 
     driverManager()->uninstallDriver();
+
+    return true;
 }
 
 bool FortManager::setupDriver()
diff --git a/src/ui/fortmanager.h b/src/ui/fortmanager.h
index a9a44912..44862111 100644
--- a/src/ui/fortmanager.h
+++ b/src/ui/fortmanager.h
@@ -86,8 +86,8 @@ signals:
     void graphWindowChanged(bool visible);
 
 public slots:
-    void installDriver();
-    void removeDriver();
+    bool installDriver();
+    bool removeDriver();
 
     void show();
 
diff --git a/src/ui/rpc/drivermanagerrpc.cpp b/src/ui/rpc/drivermanagerrpc.cpp
index 10c67df0..ce2eba92 100644
--- a/src/ui/rpc/drivermanagerrpc.cpp
+++ b/src/ui/rpc/drivermanagerrpc.cpp
@@ -21,14 +21,14 @@ RpcManager *DriverManagerRpc::rpcManager() const
     return fortManager()->rpcManager();
 }
 
-void DriverManagerRpc::reinstallDriver()
+bool DriverManagerRpc::reinstallDriver()
 {
-    rpcManager()->invokeOnServer(Control::Rpc_DriverManager_reinstallDriver);
+    return rpcManager()->doOnServer(Control::Rpc_DriverManager_reinstallDriver);
 }
 
-void DriverManagerRpc::uninstallDriver()
+bool DriverManagerRpc::uninstallDriver()
 {
-    rpcManager()->invokeOnServer(Control::Rpc_DriverManager_uninstallDriver);
+    return rpcManager()->doOnServer(Control::Rpc_DriverManager_uninstallDriver);
 }
 
 void DriverManagerRpc::updateState(quint32 errorCode, bool isDeviceOpened)
diff --git a/src/ui/rpc/drivermanagerrpc.h b/src/ui/rpc/drivermanagerrpc.h
index ad993632..befc4d18 100644
--- a/src/ui/rpc/drivermanagerrpc.h
+++ b/src/ui/rpc/drivermanagerrpc.h
@@ -21,8 +21,8 @@ public:
 
     void initialize() override { }
 
-    void reinstallDriver() override;
-    void uninstallDriver() override;
+    bool reinstallDriver() override;
+    bool uninstallDriver() override;
 
     void updateState(quint32 errorCode, bool isDeviceOpened);
 
diff --git a/src/ui/rpc/rpcmanager.cpp b/src/ui/rpc/rpcmanager.cpp
index efd20e53..31199c2a 100644
--- a/src/ui/rpc/rpcmanager.cpp
+++ b/src/ui/rpc/rpcmanager.cpp
@@ -184,14 +184,20 @@ void RpcManager::sendResult(ControlWorker *w, bool ok, const QVariantList &args)
     w->sendCommand(ok ? Control::Rpc_Result_Ok : Control::Rpc_Result_Error, args);
 }
 
-void RpcManager::invokeOnServer(Control::Command cmd, const QVariantList &args)
+bool RpcManager::invokeOnServer(Control::Command cmd, const QVariantList &args)
 {
-    client()->sendCommand(cmd, args);
+    return client()->sendCommand(cmd, args);
 }
 
 bool RpcManager::doOnServer(Control::Command cmd, const QVariantList &args)
 {
-    invokeOnServer(cmd, args);
+    if (!client()->isConnected()) {
+        fortManager()->showErrorBox("Service isn't available.");
+        return false;
+    }
+
+    if (!invokeOnServer(cmd, args))
+        return false;
 
     if (!waitResult()) {
         fortManager()->showErrorBox("Service isn't responding.");
@@ -280,7 +286,7 @@ bool RpcManager::processManagerRpc(
         return processConfManagerRpc(w, cmd, args);
 
     case Control::Rpc_DriverManager:
-        return processDriverManagerRpc(cmd, args);
+        return processDriverManagerRpc(w, cmd, args);
 
     case Control::Rpc_QuotaManager:
         return processQuotaManagerRpc(cmd, args);
@@ -398,14 +404,15 @@ bool RpcManager::processConfManagerRpc(
     }
 }
 
-bool RpcManager::processDriverManagerRpc(Control::Command cmd, const QVariantList &args)
+bool RpcManager::processDriverManagerRpc(
+        ControlWorker *w, Control::Command cmd, const QVariantList &args)
 {
     switch (cmd) {
     case Control::Rpc_DriverManager_reinstallDriver:
-        fortManager()->installDriver();
+        sendResult(w, fortManager()->installDriver());
         return true;
     case Control::Rpc_DriverManager_uninstallDriver:
-        fortManager()->removeDriver();
+        sendResult(w, fortManager()->removeDriver());
         return true;
     case Control::Rpc_DriverManager_updateState:
         if (auto dm = qobject_cast<DriverManagerRpc *>(driverManager())) {
diff --git a/src/ui/rpc/rpcmanager.h b/src/ui/rpc/rpcmanager.h
index 4d5af753..674e5946 100644
--- a/src/ui/rpc/rpcmanager.h
+++ b/src/ui/rpc/rpcmanager.h
@@ -43,7 +43,7 @@ public:
     bool waitResult();
     void sendResult(ControlWorker *w, bool ok, const QVariantList &args = {});
 
-    void invokeOnServer(Control::Command cmd, const QVariantList &args = {});
+    bool invokeOnServer(Control::Command cmd, const QVariantList &args = {});
     bool doOnServer(Control::Command cmd, const QVariantList &args = {});
 
     bool processCommandRpc(ControlWorker *w, Control::Command cmd, const QVariantList &args,
@@ -72,7 +72,7 @@ private:
 
     bool processAppInfoManagerRpc(Control::Command cmd, const QVariantList &args);
     bool processConfManagerRpc(ControlWorker *w, Control::Command cmd, const QVariantList &args);
-    bool processDriverManagerRpc(Control::Command cmd, const QVariantList &args);
+    bool processDriverManagerRpc(ControlWorker *w, Control::Command cmd, const QVariantList &args);
     bool processQuotaManagerRpc(Control::Command cmd, const QVariantList &args);
     bool processStatManagerRpc(ControlWorker *w, Control::Command cmd, const QVariantList &args);
     bool processTaskManagerRpc(Control::Command cmd, const QVariantList &args);