diff --git a/components/net/lwip-2.1.2/src/lwipopts.h b/components/net/lwip-2.1.2/src/lwipopts.h
index 265520f2697781b595d9caa6c4f63c7745e1aeb2..75bdd2fcdcdca94d15f0b173a136857eeb5f40c0 100644
--- a/components/net/lwip-2.1.2/src/lwipopts.h
+++ b/components/net/lwip-2.1.2/src/lwipopts.h
@@ -382,8 +382,7 @@
 #define TCP_MAXRTX                  12
 
 /* Maximum number of retransmissions of SYN segments. */
-//zhaocj modified on 2021-07-07:Increase the number of retransmissions of SYN packets
-#define TCP_SYNMAXRTX               8 //4
+#define TCP_SYNMAXRTX               4
 
 /* tcpip thread options */
 #ifdef RT_LWIP_TCPTHREAD_PRIORITY