diff --git a/k8scan/main.go b/k8scan/main.go
index 0629928..e74a6cf 100644
--- a/k8scan/main.go
+++ b/k8scan/main.go
@@ -211,10 +211,12 @@ func scanIP(ip string, port int) {
 func portOpen(ip string, port int) bool {
 	c, err := net.DialTimeout("tcp", fmt.Sprintf("%s:%d", ip, port), timeoutPing)
 	if err != nil {
-		// logrus.Warnf("listen at %s:%s failed: %v", ip, port, err)
+		logrus.Debugf("listen at %s:%s failed: %v", ip, port, err)
 		return false
 	}
-	defer c.Close()
+	if c != nil {
+		c.Close()
+	}
 
 	return true
 }
@@ -247,7 +249,7 @@ func isKubernetesDashboard(ip string, port int) (bool, string) {
 		resp, err = client.Get(uri)
 	}
 	if err != nil {
-		//logrus.Warnf("getting %s:%s failed: %v", ip, port, err)
+		logrus.Debugf("getting %s:%s failed: %v", ip, port, err)
 		return false, ""
 	}
 	defer resp.Body.Close()