diff --git a/recorder/cmd/main.go b/recorder/cmd/main.go
index 6539f3d..1d1ab85 100644
--- a/recorder/cmd/main.go
+++ b/recorder/cmd/main.go
@@ -3,6 +3,7 @@ package main
 import (
 	"flag"
 	"net"
+	"os"
 	"time"
 	"vncproxy/client"
 	"vncproxy/common"
@@ -21,6 +22,19 @@ func main() {
 
 	flag.Parse()
 
+	if *targetVncPort == "" {
+		logger.Error("no target vnc server port defined")
+		flag.Usage()
+		os.Exit(1)
+	}
+
+	if *targetVncPass == "" {
+		logger.Warn("no password defined, trying to connect with null authentication")
+	}
+	if *recordDir == "" {
+		logger.Warn("FBS recording is turned off")
+	}
+
 	//nc, err := net.Dial("tcp", "192.168.1.101:5903")
 	nc, err := net.Dial("tcp", "localhost:"+*targetVncPort)