diff --git a/src/rpc/src/rpcMain.c b/src/rpc/src/rpcMain.c
index 2e8c4bbc3035d1114c88dff5253b30bd21fea33e..36d74189f5045c7a7d8321ca5c37844e5dbc7aa2 100644
--- a/src/rpc/src/rpcMain.c
+++ b/src/rpc/src/rpcMain.c
@@ -793,7 +793,7 @@ static SRpcConn *rpcProcessMsgHead(SRpcInfo *pRpc, SRecvInfo *pRecv) {
   sid = pConn->sid;
 
   pConn->chandle = pRecv->chandle;
-  if (pRecv->port) pConn->peerPort = pRecv->port;
+  if (pConn->peerPort == 0) pConn->peerPort = pRecv->port;
   if (pHead->port) pConn->peerPort = htons(pHead->port); 
 
   terrno = rpcCheckAuthentication(pConn, (char *)pHead, pRecv->msgLen);
diff --git a/src/rpc/src/rpcUdp.c b/src/rpc/src/rpcUdp.c
index 4a5fc7ba271d637c428f78fa10f6da754806f16a..8d5721a437bcfe531cbdeea580d33dc5401bba5b 100644
--- a/src/rpc/src/rpcUdp.c
+++ b/src/rpc/src/rpcUdp.c
@@ -127,7 +127,7 @@ void *taosInitUdpConnection(uint32_t ip, uint16_t port, char *label, int threads
     unsigned int       addrlen = sizeof(sin);
     if (getsockname(pConn->fd, (struct sockaddr *)&sin, &addrlen) == 0 && sin.sin_family == AF_INET &&
         addrlen == sizeof(sin)) {
-      pConn->localPort = (int16_t)ntohs(sin.sin_port);
+      pConn->localPort = (uint16_t)ntohs(sin.sin_port);
     }
 
     strcpy(pConn->label, label);
@@ -198,8 +198,7 @@ void *taosOpenUdpConnection(void *shandle, void *thandle, uint32_t ip, uint16_t
   SUdpConn *pConn = pSet->udpConn + pSet->index;
   pConn->port = port;
 
-  tTrace("%s UDP connection is setup, ip:%x:%hu, local:%x:%d", pConn->label, ip, port, pSet->ip,
-         ntohs((uint16_t)pConn->localPort));
+  tTrace("%s UDP connection is setup, ip:%x:%hu, local:%x:%d", pConn->label, ip, port, pSet->ip, pConn->localPort);
 
   return pConn;
 }
@@ -219,16 +218,14 @@ static void *taosRecvUdpData(void *param) {
 
   while (1) {
     dataLen = recvfrom(pConn->fd, pConn->buffer, RPC_MAX_UDP_SIZE, 0, (struct sockaddr *)&sourceAdd, &addLen);
-    tTrace("%s msg is recv from 0x%x:%hu len:%d", pConn->label, sourceAdd.sin_addr.s_addr, ntohs(sourceAdd.sin_port),
-           dataLen);
+    port = ntohs(sourceAdd.sin_port);
+    tTrace("%s msg is recv from 0x%x:%hu len:%d", pConn->label, sourceAdd.sin_addr.s_addr, port, dataLen);
 
     if (dataLen < sizeof(SRpcHead)) {
       tError("%s recvfrom failed, reason:%s\n", pConn->label, strerror(errno));
       continue;
     }
 
-    port = ntohs(sourceAdd.sin_port);
-
     int   processedLen = 0, leftLen = 0;
     int   msgLen = 0;
     int   count = 0;