diff --git a/src/modules/trace/controller/tcpdump.go b/src/modules/trace/controller/tcpdump.go
index 62dc4f62..d4ffabea 100644
--- a/src/modules/trace/controller/tcpdump.go
+++ b/src/modules/trace/controller/tcpdump.go
@@ -70,6 +70,10 @@ func (s *TcpdumpController) NeTask(c *gin.Context) {
 		c.JSON(200, result.ErrMsg(err.Error()))
 		return
 	}
+	if strings.Contains(msg, "command not found") {
+		c.JSON(200, result.ErrMsg("Command [tcpdump] Not Found"))
+		return
+	}
 
 	c.JSON(200, result.OkData(map[string]any{
 		"cmd":      cmdStr,
@@ -211,6 +215,14 @@ func (s *TcpdumpController) NeUPFTask(c *gin.Context) {
 			c.JSON(200, result.ErrMsg(err.Error()))
 			return
 		}
+		if strings.Contains(msg, "command not found") {
+			c.JSON(200, result.ErrMsg("Command [expect] Not Found"))
+			return
+		}
+		if strings.Contains(msg, "Unable to connect to remote host") {
+			c.JSON(200, result.ErrMsg("Connection Refused"))
+			return
+		}
 		s := strings.Index(msg, "pcap dispatch trace:")
 		if s != -1 {
 			e := strings.Index(msg, "\r\nupfd1#")