diff --git a/src/client/src/tscSQLParser.c b/src/client/src/tscSQLParser.c
index c74d0ef2cf14ed2fcd7520a870ca48c51f059039..8e4ef91e27e43382100f6a1d9bff3391222634b5 100644
--- a/src/client/src/tscSQLParser.c
+++ b/src/client/src/tscSQLParser.c
@@ -5913,25 +5913,33 @@ int32_t doLocalQueryProcess(SSqlCmd* pCmd, SQueryInfo* pQueryInfo, SQuerySQL* pQ
   if (pExprList->nExpr != 1) {
     return invalidSqlErrMsg(tscGetErrorMsgPayload(pCmd), msg1);
   }
-
+  bool server_status = false;
   tSQLExpr* pExpr = pExprList->a[0].pNode;
   if (pExpr->operand.z == NULL) {
-    return invalidSqlErrMsg(tscGetErrorMsgPayload(pCmd), msg2);
-  }
-
+    //handle 'select 1'
+    if (pExpr->token.n == 1 && 0 == strncasecmp(pExpr->token.z, "1", 1)) {
+      server_status = true; 
+    } else {
+      return invalidSqlErrMsg(tscGetErrorMsgPayload(pCmd), msg2);
+    } 
+  } 
   // TODO redefine the function
-  SDNodeDynConfOption functionsInfo[5] = {{"database()", 10},
-                                          {"server_version()", 16},
-                                          {"server_status()", 15},
-                                          {"client_version()", 16},
-                                          {"current_user()", 14}};
+   SDNodeDynConfOption functionsInfo[5] = {{"database()", 10},
+                                            {"server_version()", 16},
+                                            {"server_status()", 15},
+                                            {"client_version()", 16},
+                                            {"current_user()", 14}};
 
   int32_t index = -1;
-  for (int32_t i = 0; i < tListLen(functionsInfo); ++i) {
-    if (strncasecmp(functionsInfo[i].name, pExpr->operand.z, functionsInfo[i].len) == 0 &&
-        functionsInfo[i].len == pExpr->operand.n) {
-      index = i;
-      break;
+  if (server_status == true) {
+    index = 2;
+  } else {
+    for (int32_t i = 0; i < tListLen(functionsInfo); ++i) {
+      if (strncasecmp(functionsInfo[i].name, pExpr->operand.z, functionsInfo[i].len) == 0 &&
+          functionsInfo[i].len == pExpr->operand.n) {
+        index = i;
+        break;
+      }
     }
   }
 
diff --git a/src/rpc/src/rpcMain.c b/src/rpc/src/rpcMain.c
index 587c079fe6201ac804aca35ab15d54bff968688e..596a3b28e2544c76cb213fe01a70e20deeb03649 100644
--- a/src/rpc/src/rpcMain.c
+++ b/src/rpc/src/rpcMain.c
@@ -631,15 +631,19 @@ static void rpcReleaseConn(SRpcConn *pConn) {
     // if there is an outgoing message, free it
     if (pConn->outType && pConn->pReqMsg) {
       SRpcReqContext *pContext = pConn->pContext;
-      if (pContext->pRsp) {   
+      if (pContext) {
+        if (pContext->pRsp) {   
         // for synchronous API, post semaphore to unblock app
-        pContext->pRsp->code = TSDB_CODE_RPC_APP_ERROR;
-        pContext->pRsp->pCont = NULL;
-        pContext->pRsp->contLen = 0;
-        tsem_post(pContext->pSem);
+          pContext->pRsp->code = TSDB_CODE_RPC_APP_ERROR;
+          pContext->pRsp->pCont = NULL;
+          pContext->pRsp->contLen = 0;
+          tsem_post(pContext->pSem);
+        }
+        pContext->pConn = NULL; 
+        taosRemoveRef(tsRpcRefId, pContext->rid);
+      } else {
+        assert(0); 
       }
-      pContext->pConn = NULL; 
-      taosRemoveRef(tsRpcRefId, pContext->rid);
     }
   }
 
@@ -1083,7 +1087,11 @@ static void *rpcProcessMsgFromPeer(SRecvInfo *pRecv) {
         if (code == TSDB_CODE_RPC_INVALID_TIME_STAMP || code == TSDB_CODE_RPC_AUTH_FAILURE) {
           rpcCloseConn(pConn);
         }
-        tDebug("%s %p %p, %s is sent with error code:0x%x", pRpc->label, pConn, (void *)pHead->ahandle, taosMsg[pHead->msgType+1], code);
+        if (pHead->msgType + 1 > 1 && pHead->msgType+1 < TSDB_MSG_TYPE_MAX) {
+          tDebug("%s %p %p, %s is sent with error code:0x%x", pRpc->label, pConn, (void *)pHead->ahandle, taosMsg[pHead->msgType+1], code);
+        } else {
+          tError("%s %p %p, %s is sent with error code:0x%x", pRpc->label, pConn, (void *)pHead->ahandle, taosMsg[pHead->msgType], code);
+        }     
       } 
     } else { // msg is passed to app only parsing is ok 
       rpcProcessIncomingMsg(pConn, pHead, pContext);
diff --git a/src/rpc/src/rpcTcp.c b/src/rpc/src/rpcTcp.c
index 2850046d050cba4adceeac615c0672d36dfed7d9..178b96c423641ccc6be84c57ca71fe7b85fd7a33 100644
--- a/src/rpc/src/rpcTcp.c
+++ b/src/rpc/src/rpcTcp.c
@@ -242,7 +242,14 @@ static void *taosAcceptTcpConnection(void *arg) {
 
     taosKeepTcpAlive(connFd);
     struct timeval to={1, 0};
-    taosSetSockOpt(connFd, SOL_SOCKET, SO_RCVTIMEO, &to, sizeof(to));
+    int32_t ret = taosSetSockOpt(connFd, SOL_SOCKET, SO_RCVTIMEO, &to, sizeof(to));
+    if (ret != 0) {
+      taosCloseSocket(connFd);
+      tError("%s failed to set recv timeout fd(%s)for connection from:%s:%hu", pServerObj->label, strerror(errno),
+             taosInetNtoa(caddr.sin_addr), htons(caddr.sin_port));
+      continue;
+    }
+    
 
     // pick up the thread to handle this connection
     pThreadObj = pServerObj->pThreadObj[threadId];
diff --git a/src/rpc/test/rclient.c b/src/rpc/test/rclient.c
index 5721525adee3fc847a1ba2476ccb0995fb50a65c..faa6d40da398045e43dba3bbdbaf9ef6c7ccb1ff 100644
--- a/src/rpc/test/rclient.c
+++ b/src/rpc/test/rclient.c
@@ -188,7 +188,8 @@ int main(int argc, char *argv[]) {
   tInfo("it takes %.3f mseconds to send %d requests to server", usedTime, numOfReqs*appThreads);
   tInfo("Performance: %.3f requests per second, msgSize:%d bytes", 1000.0*numOfReqs*appThreads/usedTime, msgSize);
 
-  getchar();
+  int ch = getchar();
+  UNUSED(ch); 
 
   taosCloseLog();