diff --git a/client/portgroup.cpp b/client/portgroup.cpp
index c609d3f..404e942 100644
--- a/client/portgroup.cpp
+++ b/client/portgroup.cpp
@@ -200,6 +200,19 @@ void PortGroup::processVersionCompatibility(PbRpcController *controller)
                 qPrintable(QString::fromStdString(verCompat->notes())));
         compat = kIncompatible;
         emit portGroupDataChanged(mPortGroupId);
+
+        QMessageBox msgBox;
+        msgBox.setIcon(QMessageBox::Warning);
+        msgBox.setTextFormat(Qt::RichText);
+        msgBox.setStyleSheet("messagebox-text-interaction-flags: 5");
+        msgBox.setText(tr("The Drone agent at %1:%2 is incompatible with this "
+                          "Ostinato version - %3")
+                              .arg(serverName())
+                              .arg(int(serverPort()))
+                              .arg(version));
+        msgBox.setInformativeText(QString::fromStdString(verCompat->notes()));
+        msgBox.exec();
+
         goto _error_exit;
     }
 
diff --git a/server/myservice.cpp b/server/myservice.cpp
index 6ba4f15..0784830 100644
--- a/server/myservice.cpp
+++ b/server/myservice.cpp
@@ -590,7 +590,7 @@ void MyService::checkVersion(::google::protobuf::RpcController* controller,
     }
     else {
         response->set_result(OstProto::VersionCompatibility::kIncompatible);
-        response->set_notes(QString("Drone needs client version %1.%2.x")
+        response->set_notes(QString("Drone needs controller version %1.%2.x")
                 .arg(my[0], my[1]).toStdString());
         static_cast<PbRpcController*>(controller)->TriggerDisconnect();
     }