diff --git a/source/libs/transport/src/trans.c b/source/libs/transport/src/trans.c
index 317f80c48d00b0da50505a059e56b3ea05ff309a..9d0fba488510a5c5492fda3795b007760b5d0936 100644
--- a/source/libs/transport/src/trans.c
+++ b/source/libs/transport/src/trans.c
@@ -144,7 +144,7 @@ void rpcUnrefHandle(void* handle, int8_t type) {
   (*taosUnRefHandle[type])(handle);
 }
 
-void rpcRegisterBrokenLinkArg(SRpcMsg* msg) { rpcSendResponse(msg); }
+void rpcRegisterBrokenLinkArg(SRpcMsg* msg) { transRegisterMsg(msg); }
 void rpcReleaseHandle(void* handle, int8_t type) {
   assert(type == TAOS_CONN_SERVER || type == TAOS_CONN_CLIENT);
   (*transReleaseHandle[type])(handle);
diff --git a/source/libs/transport/src/transCli.c b/source/libs/transport/src/transCli.c
index 8415b4d83d13816c591a609f9ec240944e7b658b..fe5d8bd7f5de8ac85a8c4f34c98e3f0d2b3efb8c 100644
--- a/source/libs/transport/src/transCli.c
+++ b/source/libs/transport/src/transCli.c
@@ -132,27 +132,29 @@ static void         destroyThrdObj(SCliThrdObj* pThrd);
 #define CONN_PERSIST_TIME(para) (para * 1000 * 10)
 #define CONN_GET_HOST_THREAD(conn) (conn ? ((SCliConn*)conn)->hostThrd : NULL)
 #define CONN_GET_INST_LABEL(conn) (((STrans*)(((SCliThrdObj*)(conn)->hostThrd)->pTransInst))->label)
-#define CONN_SHOULD_RELEASE(conn, head)                            \
-  do {                                                             \
-    if ((head)->release == 1 && (head->msgLen) == sizeof(*head)) { \
-      conn->status = ConnRelease;                                  \
-      transClearBuffer(&conn->readBuf);                            \
-      transFreeMsg(transContFromHead((char*)head));                \
-      tDebug("cli conn %p receive release request", conn);         \
-      if (T_REF_VAL_GET(conn) == 1) {                              \
-        SCliThrdObj* thrd = conn->hostThrd;                        \
-        addConnToPool(thrd->pool, conn);                           \
-      }                                                            \
-      return;                                                      \
-    }                                                              \
+#define CONN_SHOULD_RELEASE(conn, head)                                                  \
+  do {                                                                                   \
+    if ((head)->release == 1 && (head->msgLen) == sizeof(*head)) {                       \
+      conn->status = ConnRelease;                                                        \
+      transClearBuffer(&conn->readBuf);                                                  \
+      transFreeMsg(transContFromHead((char*)head));                                      \
+      tDebug("cli conn %p receive release request, ref: %d", conn, T_REF_VAL_GET(conn)); \
+      while (T_REF_VAL_GET(conn) > 1) {                                                  \
+        transUnrefCliHandle(conn);                                                       \
+      }                                                                                  \
+      if (T_REF_VAL_GET(conn) == 1) {                                                    \
+        SCliThrdObj* thrd = conn->hostThrd;                                              \
+        addConnToPool(thrd->pool, conn);                                                 \
+      }                                                                                  \
+      return;                                                                            \
+    }                                                                                    \
   } while (0)
 
-#define CONN_HANDLE_THREAD_QUIT(conn, thrd) \
-  do {                                      \
-    if (thrd->quit) {                       \
-      cliHandleExcept(conn);                \
-      return;                               \
-    }                                       \
+#define CONN_HANDLE_THREAD_QUIT(thrd) \
+  do {                                \
+    if (thrd->quit) {                 \
+      return;                         \
+    }                                 \
   } while (0)
 
 #define CONN_HANDLE_BROKEN(conn) \
@@ -375,6 +377,9 @@ static SCliConn* getConnFromPool(void* pool, char* ip, uint32_t port) {
   return conn;
 }
 static void addConnToPool(void* pool, SCliConn* conn) {
+  SCliThrdObj* thrd = conn->hostThrd;
+  CONN_HANDLE_THREAD_QUIT(thrd);
+
   char key[128] = {0};
 
   transCtxDestroy(&conn->ctx);
@@ -539,7 +544,6 @@ void cliSend(SCliConn* pConn) {
   }
 
   pHead->noResp = REQUEST_NO_RESP(pMsg) ? 1 : 0;
-
   pHead->persist = REQUEST_PERSIS_HANDLE(pMsg) ? 1 : 0;
   pHead->msgType = pMsg->msgType;
   pHead->msgLen = (int32_t)htonl((uint32_t)msgLen);
@@ -594,12 +598,17 @@ static void cliHandleRelease(SCliMsg* pMsg, SCliThrdObj* pThrd) {
   SCliConn* conn = pMsg->msg.handle;
   tDebug("%s cli conn %p start to release to inst", CONN_GET_INST_LABEL(conn), conn);
 
-  transUnrefCliHandle(conn);
-  taosArrayPush(conn->cliMsgs, &pMsg);
-  if (taosArrayGetSize(conn->cliMsgs) >= 2) {
-    return;  // send one by one
+  if (T_REF_VAL_GET(conn) == 2) {
+    transUnrefCliHandle(conn);
+    taosArrayPush(conn->cliMsgs, &pMsg);
+    if (taosArrayGetSize(conn->cliMsgs) >= 2) {
+      return;  // send one by one
+    }
+    cliSend(conn);
+  } else {
+    // conn already broken down
+    transUnrefCliHandle(conn);
   }
-  cliSend(conn);
 }
 
 SCliConn* cliGetConn(SCliMsg* pMsg, SCliThrdObj* pThrd) {
@@ -836,11 +845,7 @@ void transSendRequest(void* shandle, const char* ip, uint32_t port, STransMsg* p
   if (index == -1) {
     index = cliRBChoseIdx(pTransInst);
   }
-  int32_t flen = 0;
-  if (transCompressMsg(pMsg->pCont, pMsg->contLen, &flen)) {
-    // imp later
-  }
-  tDebug("send request at thread:%d %p, dst: %s:%d", index, pMsg, ip, port);
+
   STransConnCtx* pCtx = calloc(1, sizeof(STransConnCtx));
   pCtx->ahandle = pMsg->ahandle;
   pCtx->msgType = pMsg->msgType;
@@ -851,9 +856,7 @@ void transSendRequest(void* shandle, const char* ip, uint32_t port, STransMsg* p
   if (ctx != NULL) {
     pCtx->appCtx = *ctx;
   }
-
   assert(pTransInst->connType == TAOS_CONN_CLIENT);
-  // atomic or not
 
   SCliMsg* cliMsg = calloc(1, sizeof(SCliMsg));
   cliMsg->ctx = pCtx;
@@ -862,6 +865,8 @@ void transSendRequest(void* shandle, const char* ip, uint32_t port, STransMsg* p
   cliMsg->type = Normal;
 
   SCliThrdObj* thrd = ((SCliObj*)pTransInst->tcphandle)->pThreadObj[index];
+
+  tDebug("send request at thread:%d %p, dst: %s:%d", index, pMsg, ip, port);
   transSendAsync(thrd->asyncPool, &(cliMsg->q));
 }
 
diff --git a/source/libs/transport/src/transSrv.c b/source/libs/transport/src/transSrv.c
index de96883b77d5a8c57fe927d7f27a4ef1e7fc7c3f..3daac3e6f5cbc44250363de1ba2aa98fa9ba1ccb 100644
--- a/source/libs/transport/src/transSrv.c
+++ b/source/libs/transport/src/transSrv.c
@@ -114,10 +114,6 @@ static const char* notify = "a";
       return;                                                      \
     }                                                              \
   } while (0)
-// refactor later
-static int transAddAuthPart(SSrvConn* pConn, char* msg, int msgLen);
-
-static int uvAuthMsg(SSrvConn* pConn, char* msg, int msgLen);
 
 static void uvAllocConnBufferCb(uv_handle_t* handle, size_t suggested_size, uv_buf_t* buf);
 static void uvAllocRecvBufferCb(uv_handle_t* handle, size_t suggested_size, uv_buf_t* buf);
@@ -144,9 +140,9 @@ static void      destroyConn(SSrvConn* conn, bool clear /*clear handle or not*/)
 
 static void uvHandleQuit(SSrvMsg* msg, SWorkThrdObj* thrd);
 static void uvHandleRelease(SSrvMsg* msg, SWorkThrdObj* thrd);
-static void uvHandleSendResp(SSrvMsg* msg, SWorkThrdObj* thrd);
+static void uvHandleResp(SSrvMsg* msg, SWorkThrdObj* thrd);
 static void uvHandleRegister(SSrvMsg* msg, SWorkThrdObj* thrd);
-static void (*transAsyncHandle[])(SSrvMsg* msg, SWorkThrdObj* thrd) = {uvHandleSendResp, uvHandleQuit, uvHandleRelease,
+static void (*transAsyncHandle[])(SSrvMsg* msg, SWorkThrdObj* thrd) = {uvHandleResp, uvHandleQuit, uvHandleRelease,
                                                                        uvHandleRegister};
 
 static void uvDestroyConn(uv_handle_t* handle);
@@ -165,59 +161,6 @@ void uvAllocRecvBufferCb(uv_handle_t* handle, size_t suggested_size, uv_buf_t* b
   transAllocBuffer(pBuf, buf);
 }
 
-static int uvAuthMsg(SSrvConn* pConn, char* msg, int len) {
-  STransMsgHead* pHead = (STransMsgHead*)msg;
-
-  int code = 0;
-
-  if ((pConn->secured && pHead->spi == 0) || (pHead->spi == 0 && pConn->spi == 0)) {
-    // secured link, or no authentication
-    pHead->msgLen = (int32_t)htonl((uint32_t)pHead->msgLen);
-    // tTrace("%s, secured link, no auth is required", pConn->info);
-    return 0;
-  }
-
-  if (!rpcIsReq(pHead->msgType)) {
-    // for response, if code is auth failure, it shall bypass the auth process
-    code = htonl(pHead->code);
-    if (code == TSDB_CODE_RPC_INVALID_TIME_STAMP || code == TSDB_CODE_RPC_AUTH_FAILURE ||
-        code == TSDB_CODE_RPC_INVALID_VERSION || code == TSDB_CODE_RPC_AUTH_REQUIRED ||
-        code == TSDB_CODE_MND_USER_NOT_EXIST || code == TSDB_CODE_RPC_NOT_READY) {
-      pHead->msgLen = (int32_t)htonl((uint32_t)pHead->msgLen);
-      // tTrace("%s, dont check authentication since code is:0x%x", pConn->info, code);
-      return 0;
-    }
-  }
-
-  code = 0;
-  if (pHead->spi == pConn->spi) {
-    // authentication
-    SRpcDigest* pDigest = (SRpcDigest*)((char*)pHead + len - sizeof(SRpcDigest));
-
-    int32_t delta;
-    delta = (int32_t)htonl(pDigest->timeStamp);
-    delta -= (int32_t)taosGetTimestampSec();
-    if (abs(delta) > 900) {
-      tWarn("%s, time diff:%d is too big, msg discarded", pConn->info, delta);
-      code = TSDB_CODE_RPC_INVALID_TIME_STAMP;
-    } else {
-      if (transAuthenticateMsg(pHead, len - TSDB_AUTH_LEN, pDigest->auth, pConn->secret) < 0) {
-        // tDebug("%s, authentication failed, msg discarded", pConn->info);
-        code = TSDB_CODE_RPC_AUTH_FAILURE;
-      } else {
-        pHead->msgLen = (int32_t)htonl((uint32_t)pHead->msgLen) - sizeof(SRpcDigest);
-        if (!rpcIsReq(pHead->msgType)) pConn->secured = 1;  // link is secured for client
-        // tTrace("%s, message is authenticated", pConn->info);
-      }
-    }
-  } else {
-    tDebug("%s, auth spi:%d not matched with received:%d", pConn->info, pConn->spi, pHead->spi);
-    code = pHead->spi ? TSDB_CODE_RPC_AUTH_FAILURE : TSDB_CODE_RPC_AUTH_REQUIRED;
-  }
-
-  return code;
-}
-
 // refers specifically to query or insert timeout
 static void uvHandleActivityTimeout(uv_timer_t* handle) {
   SSrvConn* conn = handle->data;
@@ -225,34 +168,20 @@ static void uvHandleActivityTimeout(uv_timer_t* handle) {
 }
 
 static void uvHandleReq(SSrvConn* pConn) {
-  SRecvInfo    info;
-  SRecvInfo*   p = &info;
   SConnBuffer* pBuf = &pConn->readBuf;
-  p->msg = pBuf->buf;
-  p->msgLen = pBuf->len;
-  p->ip = 0;
-  p->port = 0;
-  p->shandle = pConn->pTransInst;  //
-  p->thandle = pConn;
-  p->chandle = NULL;
-
-  STransMsgHead* pHead = (STransMsgHead*)p->msg;
+  char*        msg = pBuf->buf;
+  uint32_t     msgLen = pBuf->len;
+
+  STransMsgHead* pHead = (STransMsgHead*)msg;
   if (pHead->secured == 1) {
-    STransUserMsg* uMsg = (STransUserMsg*)((char*)p->msg + p->msgLen - sizeof(STransUserMsg));
+    STransUserMsg* uMsg = (STransUserMsg*)((char*)msg + msgLen - sizeof(STransUserMsg));
     memcpy(pConn->user, uMsg->user, tListLen(uMsg->user));
     memcpy(pConn->secret, uMsg->secret, tListLen(uMsg->secret));
   }
   pHead->code = htonl(pHead->code);
-
-  int32_t dlen = 0;
-  if (transDecompressMsg(NULL, 0, NULL)) {
-    // add compress later
-    // pHead = rpcDecompresSTransMsg(pHead);
-  } else {
-    pHead->msgLen = htonl(pHead->msgLen);
-    if (pHead->secured == 1) {
-      pHead->msgLen -= sizeof(STransUserMsg);
-    }
+  pHead->msgLen = htonl(pHead->msgLen);
+  if (pHead->secured == 1) {
+    pHead->msgLen -= sizeof(STransUserMsg);
   }
 
   CONN_SHOULD_RELEASE(pConn, pHead);
@@ -289,10 +218,9 @@ static void uvHandleReq(SSrvConn* pConn) {
     transMsg.handle = pConn;
   }
 
-  STrans* pTransInst = (STrans*)p->shandle;
+  STrans* pTransInst = pConn->pTransInst;
   (*pTransInst->cfp)(pTransInst->parent, &transMsg, NULL);
   // uv_timer_start(&pConn->pTimer, uvHandleActivityTimeout, pRpc->idleTime * 10000, 0);
-  // auth
 }
 
 void uvOnRecvCb(uv_stream_t* cli, ssize_t nread, const uv_buf_t* buf) {
@@ -351,24 +279,26 @@ void uvOnSendCb(uv_write_t* req, int status) {
       if (msg->type == Release && conn->status != ConnNormal) {
         conn->status = ConnNormal;
         transUnrefSrvHandle(conn);
-      } else if (msg->type == Register && conn->status == ConnAcquire) {
-        conn->regArg.notifyCount = 0;
-        conn->regArg.init = 1;
-        conn->regArg.msg = msg->msg;
-        if (conn->broken) {
-          STrans* pTransInst = conn->pTransInst;
-          (pTransInst->cfp)(pTransInst->parent, &(conn->regArg.msg), NULL);
-          memset(&conn->regArg, 0, sizeof(conn->regArg));
-        }
-        free(msg);
-        return;
       }
       destroySmsg(msg);
       // send second data, just use for push
       if (taosArrayGetSize(conn->srvMsgs) > 0) {
         tTrace("resent server conn %p sending msg size: %d", conn, (int)taosArrayGetSize(conn->srvMsgs));
         msg = (SSrvMsg*)taosArrayGetP(conn->srvMsgs, 0);
-        uvStartSendRespInternal(msg);
+        if (msg->type == Register && conn->status == ConnAcquire) {
+          conn->regArg.notifyCount = 0;
+          conn->regArg.init = 1;
+          conn->regArg.msg = msg->msg;
+          if (conn->broken) {
+            STrans* pTransInst = conn->pTransInst;
+            (pTransInst->cfp)(pTransInst->parent, &(conn->regArg.msg), NULL);
+            memset(&conn->regArg, 0, sizeof(conn->regArg));
+          }
+          taosArrayRemove(conn->srvMsgs, 0);
+          free(msg);
+        } else {
+          uvStartSendRespInternal(msg);
+        }
       }
     }
   } else {
@@ -387,7 +317,6 @@ static void uvOnPipeWriteCb(uv_write_t* req, int status) {
 }
 
 static void uvPrepareSendData(SSrvMsg* smsg, uv_buf_t* wb) {
-  // impl later;
   tTrace("server conn %p prepare to send resp", smsg->pConn);
 
   SSrvConn*  pConn = smsg->pConn;
@@ -398,21 +327,27 @@ static void uvPrepareSendData(SSrvMsg* smsg, uv_buf_t* wb) {
   }
   STransMsgHead* pHead = transHeadFromCont(pMsg->pCont);
 
-  pHead->secured = pMsg->code == 0 ? 1 : 0;  //
-  pHead->msgType = smsg->pConn->inType + 1;
+  // pHead->secured = pMsg->code == 0 ? 1 : 0;  //
+  if (!pConn->secured) {
+    pConn->secured = pMsg->code == 0 ? 1 : 0;
+  }
+  pHead->secured = pConn->secured;
+
+  if (pConn->status == ConnNormal) {
+    pHead->msgType = pConn->inType + 1;
+  } else {
+    pHead->msgType = smsg->type == Release ? 0 : pMsg->msgType;
+  }
   pHead->release = smsg->type == Release ? 1 : 0;
   pHead->code = htonl(pMsg->code);
-  // add more info
+
   char*   msg = (char*)pHead;
   int32_t len = transMsgLenFromCont(pMsg->contLen);
-  if (transCompressMsg(msg, len, NULL)) {
-    // impl later
-  }
   tDebug("server conn %p %s is sent to %s:%d, local info: %s:%d", pConn, TMSG_INFO(pHead->msgType),
          taosInetNtoa(pConn->addr.sin_addr), ntohs(pConn->addr.sin_port), taosInetNtoa(pConn->locaddr.sin_addr),
          ntohs(pConn->locaddr.sin_port));
-
   pHead->msgLen = htonl(len);
+
   wb->base = msg;
   wb->len = len;
 }
@@ -438,13 +373,12 @@ static void uvStartSendResp(SSrvMsg* smsg) {
     transUnrefSrvHandle(pConn);
   }
 
-  if (taosArrayGetSize(pConn->srvMsgs) > 0) {
+  taosArrayPush(pConn->srvMsgs, &smsg);
+  if (taosArrayGetSize(pConn->srvMsgs) > 1) {
     tDebug("server conn %p send data to client %s:%d, local info: %s:%d", pConn, taosInetNtoa(pConn->addr.sin_addr),
            ntohs(pConn->addr.sin_port), taosInetNtoa(pConn->locaddr.sin_addr), ntohs(pConn->locaddr.sin_port));
-    taosArrayPush(pConn->srvMsgs, &smsg);
     return;
   }
-  taosArrayPush(pConn->srvMsgs, &smsg);
   uvStartSendRespInternal(smsg);
   return;
 }
@@ -675,7 +609,7 @@ static SSrvConn* createConn(void* hThrd) {
 
   QUEUE_PUSH(&pThrd->conn, &pConn->queue);
   pConn->srvMsgs = taosArrayInit(2, sizeof(void*));  //
-  tTrace("conn %p created", pConn);
+  tTrace("server conn %p created", pConn);
 
   memset(&pConn->regArg, 0, sizeof(pConn->regArg));
   pConn->broken = false;
@@ -697,7 +631,7 @@ static void destroyConn(SSrvConn* conn, bool clear) {
   }
   conn->srvMsgs = taosArrayDestroy(conn->srvMsgs);
   if (clear) {
-    tTrace("try to destroy conn %p", conn);
+    tTrace("server conn %p to be destroyed", conn);
     uv_shutdown_t* req = malloc(sizeof(uv_shutdown_t));
     uv_shutdown(req, (uv_stream_t*)conn->pTcp, uvShutDownCb);
   }
@@ -720,25 +654,6 @@ static void uvDestroyConn(uv_handle_t* handle) {
     uv_stop(thrd->loop);
   }
 }
-static int transAddAuthPart(SSrvConn* pConn, char* msg, int msgLen) {
-  STransMsgHead* pHead = (STransMsgHead*)msg;
-
-  if (pConn->spi && pConn->secured == 0) {
-    // add auth part
-    pHead->spi = pConn->spi;
-    STransDigestMsg* pDigest = (STransDigestMsg*)(msg + msgLen);
-    pDigest->timeStamp = htonl(taosGetTimestampSec());
-    msgLen += sizeof(SRpcDigest);
-    pHead->msgLen = (int32_t)htonl((uint32_t)msgLen);
-    // transBuildAuthHead(pHead, msgLen - TSDB_AUTH_LEN, pDigest->auth, pConn->secret);
-    // transBuildAuthHead(pHead, msgLen - TSDB_AUTH_LEN, pDigest->auth, pConn->secret);
-  } else {
-    pHead->spi = 0;
-    pHead->msgLen = (int32_t)htonl((uint32_t)msgLen);
-  }
-
-  return msgLen;
-}
 
 void* transInitServer(uint32_t ip, uint32_t port, char* label, int numOfThreads, void* fp, void* shandle) {
   SServerObj* srv = calloc(1, sizeof(SServerObj));
@@ -815,20 +730,19 @@ void uvHandleRelease(SSrvMsg* msg, SWorkThrdObj* thrd) {
     }
     uvStartSendRespInternal(msg);
     return;
-  } else if (conn->status == ConnRelease) {
-    // already release by server app, do nothing
-  } else if (conn->status == ConnNormal) {
-    // no nothing
-    // user should not call this rpcRelease handle;
+  } else if (conn->status == ConnRelease || conn->status == ConnNormal) {
+    tDebug("server conn %p already released, ignore release-msg", conn);
   }
-  free(msg);
+  destroySmsg(msg);
 }
-void uvHandleSendResp(SSrvMsg* msg, SWorkThrdObj* thrd) {
+void uvHandleResp(SSrvMsg* msg, SWorkThrdObj* thrd) {
   // send msg to client
+  tDebug("server conn %p start to send resp", msg->pConn);
   uvStartSendResp(msg);
 }
 void uvHandleRegister(SSrvMsg* msg, SWorkThrdObj* thrd) {
   SSrvConn* conn = msg->pConn;
+  tDebug("server conn %p register brokenlink callback", conn);
   if (conn->status == ConnAcquire) {
     if (taosArrayGetSize(conn->srvMsgs) > 0) {
       taosArrayPush(conn->srvMsgs, &msg);
@@ -901,12 +815,10 @@ void transUnrefSrvHandle(void* handle) {
     return;
   }
   int ref = T_REF_DEC((SSrvConn*)handle);
-  tDebug("handle %p ref count: %d", handle, ref);
-
+  tDebug("server conn %p ref count: %d", handle, ref);
   if (ref == 0) {
     destroyConn((SSrvConn*)handle, true);
   }
-  // unref srv handle
 }
 
 void transReleaseSrvHandle(void* handle) {
@@ -951,7 +863,7 @@ void transRegisterMsg(const STransMsg* msg) {
   srvMsg->pConn = pConn;
   srvMsg->msg = *msg;
   srvMsg->type = Register;
-  tTrace("server conn %p start to send resp", pConn);
+  tTrace("server conn %p start to register brokenlink callback", pConn);
   transSendAsync(pThrd->asyncPool, &srvMsg->q);
 }
 int transGetConnInfo(void* thandle, STransHandleInfo* pInfo) {
diff --git a/source/libs/transport/test/transUT.cc b/source/libs/transport/test/transUT.cc
index 490437ac0db8c9ed148629e56b08b9d384436909..0b1b1834dfb0fae47e666f7806705a6658816b8e 100644
--- a/source/libs/transport/test/transUT.cc
+++ b/source/libs/transport/test/transUT.cc
@@ -35,6 +35,8 @@ int port = 7000;
 typedef void (*CB)(void *parent, SRpcMsg *pMsg, SEpSet *pEpSet);
 
 static void processContinueSend(void *parent, SRpcMsg *pMsg, SEpSet *pEpSet);
+static void processReleaseHandleCb(void *parent, SRpcMsg *pMsg, SEpSet *pEpSet);
+static void processRegisterFailure(void *parent, SRpcMsg *pMsg, SEpSet *pEpSet);
 static void processReq(void *parent, SRpcMsg *pMsg, SEpSet *pEpSet);
 // client process;
 static void processResp(void *parent, SRpcMsg *pMsg, SEpSet *pEpSet);
@@ -167,6 +169,35 @@ static void processContinueSend(void *parent, SRpcMsg *pMsg, SEpSet *pEpSet) {
     rpcSendResponse(&rpcMsg);
   }
 }
+static void processReleaseHandleCb(void *parent, SRpcMsg *pMsg, SEpSet *pEpSet) {
+  SRpcMsg rpcMsg = {0};
+  rpcMsg.pCont = rpcMallocCont(100);
+  rpcMsg.contLen = 100;
+  rpcMsg.handle = pMsg->handle;
+  rpcMsg.code = 0;
+  rpcSendResponse(&rpcMsg);
+
+  rpcReleaseHandle(pMsg->handle, TAOS_CONN_SERVER);
+}
+static void processRegisterFailure(void *parent, SRpcMsg *pMsg, SEpSet *pEpSet) {
+  void *handle = pMsg->handle;
+  {
+    SRpcMsg rpcMsg1 = {0};
+    rpcMsg1.pCont = rpcMallocCont(100);
+    rpcMsg1.contLen = 100;
+    rpcMsg1.handle = handle;
+    rpcMsg1.code = 0;
+    rpcRegisterBrokenLinkArg(&rpcMsg1);
+  }
+  taosMsleep(10);
+
+  SRpcMsg rpcMsg = {0};
+  rpcMsg.pCont = rpcMallocCont(100);
+  rpcMsg.contLen = 100;
+  rpcMsg.handle = pMsg->handle;
+  rpcMsg.code = 0;
+  rpcSendResponse(&rpcMsg);
+}
 // client process;
 static void processResp(void *parent, SRpcMsg *pMsg, SEpSet *pEpSet) {
   Client *client = (Client *)parent;
@@ -225,7 +256,7 @@ class TransObj {
     srv->SetSrvContinueSend(cfp);
   }
   void RestartSrv() { srv->Restart(); }
-  void cliStop() {
+  void StopCli() {
     ///////
     cli->Stop();
   }
@@ -329,32 +360,35 @@ TEST_F(TransEnv, cliPersistHandle) {
   //////////////////
 }
 
-TEST_F(TransEnv, cliReleaseHandle) {
+TEST_F(TransEnv, srvReleaseHandle) {
   SRpcMsg resp = {0};
-  for (int i = 0; i < 10; i++) {
+  tr->SetSrvContinueSend(processReleaseHandleCb);
+  // tr->Restart(processReleaseHandleCb);
+  void *handle = NULL;
+  for (int i = 0; i < 1; i++) {
     SRpcMsg req = {.handle = resp.handle, .persistHandle = 1};
     req.msgType = 1;
     req.pCont = rpcMallocCont(10);
     req.contLen = 10;
-    tr->cliSendAndRecvNoHandle(&req, &resp);
+    tr->cliSendAndRecv(&req, &resp);
+    // tr->cliSendAndRecvNoHandle(&req, &resp);
     EXPECT_TRUE(resp.code == 0);
-    //}
   }
   //////////////////
 }
 TEST_F(TransEnv, cliReleaseHandleExcept) {
   SRpcMsg resp = {0};
-  for (int i = 0; i < 10; i++) {
+  for (int i = 0; i < 3; i++) {
     SRpcMsg req = {.handle = resp.handle, .persistHandle = 1};
     req.msgType = 1;
     req.pCont = rpcMallocCont(10);
     req.contLen = 10;
-    tr->cliSendAndRecvNoHandle(&req, &resp);
-    if (i == 5) {
+    tr->cliSendAndRecv(&req, &resp);
+    if (i == 1) {
       std::cout << "stop server" << std::endl;
       tr->StopSrv();
     }
-    if (i >= 6) {
+    if (i > 1) {
       EXPECT_TRUE(resp.code != 0);
     }
   }
@@ -383,7 +417,7 @@ TEST_F(TransEnv, srvPersistHandleExcept) {
     req.contLen = 10;
     tr->cliSendAndRecv(&req, &resp);
     if (i > 2) {
-      tr->cliStop();
+      tr->StopCli();
       break;
     }
   }
@@ -413,7 +447,23 @@ TEST_F(TransEnv, cliPersistHandleExcept) {
 TEST_F(TransEnv, multiCliPersistHandleExcept) {
   // conn broken
 }
-TEST_F(TransEnv, queryExcept) {}
+TEST_F(TransEnv, queryExcept) {
+  tr->SetSrvContinueSend(processRegisterFailure);
+  SRpcMsg resp = {0};
+  for (int i = 0; i < 5; i++) {
+    SRpcMsg req = {.handle = resp.handle, .persistHandle = 1};
+    req.msgType = 1;
+    req.pCont = rpcMallocCont(10);
+    req.contLen = 10;
+    tr->cliSendAndRecv(&req, &resp);
+    if (i == 2) {
+      rpcReleaseHandle(resp.handle, TAOS_CONN_CLIENT);
+      tr->StopCli();
+      break;
+    }
+  }
+  taosMsleep(4 * 1000);
+}
 TEST_F(TransEnv, noResp) {
   SRpcMsg resp = {0};
   for (int i = 0; i < 5; i++) {