diff --git a/main.go b/main.go
index 494f30e..75a4fe7 100644
--- a/main.go
+++ b/main.go
@@ -19,7 +19,7 @@ var (
 )
 
 func init() {
-	portNumber = flag.Int(occp.FlagProbePortName, 0, "Port number of Probe")
+	portNumber = flag.Int(occp.FlagProbePortName, 60000, "Port number of Probe")
 	loggingConfigFilePath := flag.String(occp.FlagLoggingConfigFilePathName, "", "logging config path")
 	flag.Parse()
 
@@ -31,13 +31,11 @@ func main() {
 
 	c := client.New(*portNumber)
 
-	go func() {
-		err := c.Start()
-		if nil != err {
-			log.Printf("err: %v", err)
-		}
+	err := c.Start()
+	if nil != err {
+		log.Printf("err: %v", err)
 		os.Exit(1)
-	}()
+	}
 
 	interrupt := make(chan os.Signal, 1)
 	signal.Notify(interrupt,