diff --git a/source/libs/scheduler/src/schRemote.c b/source/libs/scheduler/src/schRemote.c
index bb06a25ce0..a1410f2421 100644
--- a/source/libs/scheduler/src/schRemote.c
+++ b/source/libs/scheduler/src/schRemote.c
@@ -503,7 +503,7 @@ int32_t schHandleDropCallback(void *param, SDataBuf *pMsg, int32_t code) {
   (void)rpcReleaseHandle(pMsg->handle, TAOS_CONN_CLIENT); // ignore error
 
   if (pMsg->handle == NULL) {
-    ASSERT(0);
+    qError("sch handle is NULL, may be already released and mem lea");
   }
   if (pMsg) {
     taosMemoryFree(pMsg->pData);
diff --git a/source/libs/transport/src/transCli.c b/source/libs/transport/src/transCli.c
index f866097e2a..802af1aad1 100644
--- a/source/libs/transport/src/transCli.c
+++ b/source/libs/transport/src/transCli.c
@@ -557,7 +557,6 @@ void cliHandleResp(SCliConn* conn) {
     taosMemoryFree(pHead);
     tDebug("%s conn %p recv invalid packet ", CONN_GET_INST_LABEL(conn), conn);
     // TODO: notify cb
-    // ASSERT(0);
     pThrd->notifyExceptCb(pThrd, NULL, NULL);
     return;
   }
@@ -616,6 +615,7 @@ void cliHandleResp(SCliConn* conn) {
   if (cliMayRecycleConn(conn)) {
     return;
   }
+  cliConnCheckTimoutMsg(conn);
 
   cliConnMayUpdateTimer(conn, READ_TIMEOUT);
 
diff --git a/source/libs/transport/src/transSvr.c b/source/libs/transport/src/transSvr.c
index 12d243e3d1..612bbc8301 100644
--- a/source/libs/transport/src/transSvr.c
+++ b/source/libs/transport/src/transSvr.c
@@ -555,14 +555,14 @@ static bool uvHandleReq(SSvrConn* pConn) {
   }
 
   if (pHead->seqNum == 0) {
-    // ASSERT(0);
+    STraceId* trace = &pHead->traceId;
+    tGError("%s conn %p received invalid seqNum, msgType:%s", transLabel(pInst), pConn, TMSG_INFO(pHead->msgType));
+    return false;
   }
 
   transMsg.info.handle = (void*)transAcquireExHandle(uvGetConnRefOfThrd(pThrd), pConn->refId);
   transMsg.info.refIdMgt = pThrd->connRefMgt;
 
-  // ASSERTS(transMsg.info.handle != NULL, "trans-svr failed to alloc handle to msg");
-
   // pHead->noResp = 1,
   // 1. server application should not send resp on handle
   // 2. once send out data, cli conn released to conn pool immediately
@@ -729,7 +729,6 @@ static int uvPrepareSendData(SSvrRespMsg* smsg, uv_buf_t* wb) {
 
   // handle invalid drop_task resp, TD-20098
   if (pConn->inType == TDMT_SCH_DROP_TASK && pMsg->code == TSDB_CODE_VND_INVALID_VGROUP_ID) {
-    // ASSERT(0);
     //  (void)transQueuePop(&pConn->resps);
     //  destroySmsg(smsg);
     //  return TSDB_CODE_INVALID_MSG;