diff --git a/src/rpc/src/rpcTcp.c b/src/rpc/src/rpcTcp.c
index 530a279cc72a291525356aa1f2a6495f605946a0..43c386b8b50ab79aa51403b1e71d109619cdb935 100644
--- a/src/rpc/src/rpcTcp.c
+++ b/src/rpc/src/rpcTcp.c
@@ -32,6 +32,7 @@ typedef struct SFdObj {
   struct SThreadObj *pThreadObj;
   struct SFdObj     *prev;
   struct SFdObj     *next;
+  uint64_t          ctime;  // create time
 } SFdObj;
 
 typedef struct SThreadObj {
@@ -280,6 +281,7 @@ static void *taosAcceptTcpConnection(void *arg) {
     if (pFdObj) {
       pFdObj->ip = caddr.sin_addr.s_addr;
       pFdObj->port = htons(caddr.sin_port);
+      pFdObj->ctime = taosGetTimestampMs();
       tDebug("%s new TCP connection from %s:%hu, fd:%d FD:%p numOfFds:%d", pServerObj->label,
               taosInetNtoa(caddr.sin_addr), pFdObj->port, connFd, pFdObj, pThreadObj->numOfFds);
     } else {
@@ -417,6 +419,7 @@ void *taosOpenTcpClientConnection(void *shandle, void *thandle, uint32_t ip, uin
     pFdObj->thandle = thandle;
     pFdObj->port = port;
     pFdObj->ip = ip;
+    pFdObj->ctime = taosGetTimestampMs();
     tDebug("%s %p TCP connection to 0x%x:%hu is created, localPort:%hu FD:%p numOfFds:%d",
             pThreadObj->label, thandle, ip, port, localPort, pFdObj, pThreadObj->numOfFds);
   } else {
@@ -432,7 +435,7 @@ void taosCloseTcpConnection(void *chandle) {
   if (pFdObj == NULL || pFdObj->signature != pFdObj) return;
 
   SThreadObj *pThreadObj = pFdObj->pThreadObj;
-  tDebug("%s %p TCP connection will be closed, FD:%p", pThreadObj->label, pFdObj->thandle, pFdObj);
+  tDebug("DEEP %s shutdown3 fd=%d ip=0x%x port=%d ctime=%" PRId64, pThreadObj->label, pFdObj->fd, pFdObj->ip, pFdObj->port, pFdObj->ctime);
 
   // pFdObj->thandle = NULL;
   pFdObj->closedByApp = 1;
@@ -441,11 +444,28 @@ void taosCloseTcpConnection(void *chandle) {
 
 int taosSendTcpData(uint32_t ip, uint16_t port, void *data, int len, void *chandle) {
   SFdObj *pFdObj = chandle;
-  if (pFdObj == NULL || pFdObj->signature != pFdObj) return -1;
+  if (pFdObj == NULL) {
+    tError("DEEP TCP send data failed(chandle null). data=0x%p len=%d ip=0x%0x port=%d", data, len, ip, port);
+    return -1;
+  }
+  if(pFdObj->signature != pFdObj) {
+    tError("DEEP TCP send data failed(sig diff). pFdObj=0x%p sig=0x%p data=%p len=%d ip=0x%x port=%d", pFdObj, pFdObj->signature, data, len, ip, port);
+    return -2;
+  }
+
   SThreadObj *pThreadObj = pFdObj->pThreadObj;
 
   int ret = taosWriteMsg(pFdObj->fd, data, len);
   tTrace("%s %p TCP data is sent, FD:%p fd:%d bytes:%d", pThreadObj->label, pFdObj->thandle, pFdObj, pFdObj->fd, ret);
+  if(ret < 0) {
+    tError("DEEP %s %p TCP data sent failed and try again, FD:%p fd:%d ctime=%" PRId64 " ret=%d le=%d ip=0x%x port=%d threadid=%d numofFds=%d",
+        pThreadObj->label, pFdObj->thandle, pFdObj, pFdObj->fd, pFdObj->ctime, ret, len, ip, port, pThreadObj->threadId, pThreadObj->numOfFds);
+    ret = taosWriteMsg(pFdObj->fd, data, len);
+    if(ret < 0) {
+      tError("DEEP %s %p Second TCP data sent failed, FD:%p fd:%d ctime=%" PRId64 " ret=%d le=%d ip=0x%x port=%d threadid=%d numofFds=%d",
+          pThreadObj->label, pFdObj->thandle, pFdObj, pFdObj->fd, pFdObj->ctime, ret, len, ip, port, pThreadObj->threadId, pThreadObj->numOfFds);
+    } 
+  }
 
   return ret;
 }
@@ -457,6 +477,7 @@ static void taosReportBrokenLink(SFdObj *pFdObj) {
   // notify the upper layer, so it will clean the associated context
   if (pFdObj->closedByApp == 0) {
     shutdown(pFdObj->fd, SHUT_WR);
+    tDebug("DEEP %s shutdown2 fd=%d ip=0x%x port=%d ctime=%" PRId64, pThreadObj->label, pFdObj->fd, pFdObj->ip, pFdObj->port, pFdObj->ctime);
 
     SRecvInfo recvInfo;
     recvInfo.msg = NULL;
@@ -574,6 +595,7 @@ static void *taosProcessTcpData(void *param) {
       }
 
       if (taosReadTcpData(pFdObj, &recvInfo) < 0) {
+        tDebug("DEEP %s shutdown1 fd=%d ip=0x%x port=%d ctime=%" PRId64, pThreadObj->label, pFdObj->fd, pFdObj->ip, pFdObj->port, pFdObj->ctime);
         shutdown(pFdObj->fd, SHUT_WR);
         continue;
       }
@@ -650,7 +672,10 @@ static void taosFreeFdObj(SFdObj *pFdObj) {
 
   pFdObj->signature = NULL;
   epoll_ctl(pThreadObj->pollFd, EPOLL_CTL_DEL, pFdObj->fd, NULL);
+  tDebug("DEEP %s close1 fd=%d pFdObj=%p ip=0x%x port=%d ctime=%" PRId64 " thandle=%p",
+           pThreadObj->label, pFdObj->fd, pFdObj, pFdObj->ip, pFdObj->port, pFdObj->ctime, pFdObj->thandle);
   taosCloseSocket(pFdObj->fd);
+  
 
   pThreadObj->numOfFds--;
   if (pThreadObj->numOfFds < 0)
diff --git a/src/util/src/tsocket.c b/src/util/src/tsocket.c
index 0ebe9c8f8af23186fb4cd60824bfa5641d2090a9..19c72d2e0b2b4e059883a506e3c4ad1f1b4cf809 100644
--- a/src/util/src/tsocket.c
+++ b/src/util/src/tsocket.c
@@ -129,15 +129,18 @@ int32_t taosWriteMsg(SOCKET fd, void *buf, int32_t nbytes) {
     if (nwritten <= 0) {
       if (errno == EINTR /* || errno == EAGAIN || errno == EWOULDBLOCK */)
         continue;
-      else
-        return -1;
+      else {
+        uError("DEEP write socket failed3. errno=%d fd=%d writeten=%d left=%d", errno, fd, nwritten, nleft);
+        return -3;
+      }
     } else {
       nleft -= nwritten;
       ptr += nwritten;
     }
 
     if (errno == SIGPIPE || errno == EPIPE) {
-      return -1;
+      uError("DEEP write socket failed4. errno=%d fd=%d writeten=%d left=%d", errno, fd, nwritten, nleft);
+      return -4;
     }
   }