diff --git a/include/libs/function/tudf.h b/include/libs/function/tudf.h
index b71d50d43c..6b15833917 100644
--- a/include/libs/function/tudf.h
+++ b/include/libs/function/tudf.h
@@ -111,6 +111,12 @@ int32_t udfStartUdfd(int32_t startDnodeId);
  */
 int32_t udfStopUdfd();
 
+/**
+ * get udfd pid
+ *
+ */
+ int32_t udfGetUdfdPid(int32_t* pUdfdPid);
+
 #ifdef __cplusplus
 }
 #endif
diff --git a/source/dnode/mnode/impl/src/mndProfile.c b/source/dnode/mnode/impl/src/mndProfile.c
index 0bfab227c4..ced52058e1 100644
--- a/source/dnode/mnode/impl/src/mndProfile.c
+++ b/source/dnode/mnode/impl/src/mndProfile.c
@@ -232,7 +232,6 @@ static int32_t mndProcessConnectReq(SRpcMsg *pReq) {
   }
 
   code = -1;
-
   taosIp2String(pReq->info.conn.clientIp, ip);
   if (mndCheckOperPrivilege(pMnode, pReq->info.conn.user, MND_OPER_CONNECT) != 0) {
     mGError("user:%s, failed to login from %s since %s", pReq->info.conn.user, ip, terrstr());
@@ -244,7 +243,7 @@ static int32_t mndProcessConnectReq(SRpcMsg *pReq) {
     mGError("user:%s, failed to login from %s while acquire user since %s", pReq->info.conn.user, ip, terrstr());
     goto _OVER;
   }
-
+  
   if (strncmp(connReq.passwd, pUser->pass, TSDB_PASSWORD_LEN - 1) != 0) {
     mGError("user:%s, failed to login from %s since invalid pass, input:%s", pReq->info.conn.user, ip, connReq.passwd);
     code = TSDB_CODE_MND_AUTH_FAILURE;
@@ -270,6 +269,7 @@ static int32_t mndProcessConnectReq(SRpcMsg *pReq) {
     }
   }
 
+_CONNECT:
   pConn = mndCreateConn(pMnode, pReq->info.conn.user, connReq.connType, pReq->info.conn.clientIp,
                         pReq->info.conn.clientPort, connReq.pid, connReq.app, connReq.startTime);
   if (pConn == NULL) {
diff --git a/source/libs/function/src/tudf.c b/source/libs/function/src/tudf.c
index 31a7dfdbc5..5b9f44c812 100644
--- a/source/libs/function/src/tudf.c
+++ b/source/libs/function/src/tudf.c
@@ -255,6 +255,18 @@ int32_t udfStopUdfd() {
   return 0;
 }
 
+int32_t udfGetUdfdPid(int32_t* pUdfdPid) {
+  SUdfdData *pData = &udfdGlobal;
+  if (pData->spawnErr) {
+    return pData->spawnErr;
+  }
+  uv_pid_t pid = uv_process_get_pid(&pData->process);
+  if (pUdfdPid) {
+    *pUdfdPid = (int32_t)pid;
+  }
+  return TSDB_CODE_SUCCESS;
+}
+
 //==============================================================================================
 /* Copyright (c) 2013, Ben Noordhuis <info@bnoordhuis.nl>
  * The QUEUE is copied from queue.h under libuv
diff --git a/source/libs/function/src/udfd.c b/source/libs/function/src/udfd.c
index 3b827a2f99..93259924d5 100644
--- a/source/libs/function/src/udfd.c
+++ b/source/libs/function/src/udfd.c
@@ -965,40 +965,6 @@ int32_t udfdFillUdfInfoFromMNode(void *clientRpc, char *udfName, SUdf *udf) {
   return code;
 }
 
-int32_t udfdConnectToMnode() {
-  SConnectReq connReq = {0};
-  connReq.connType = CONN_TYPE__UDFD;
-  tstrncpy(connReq.app, "udfd", sizeof(connReq.app));
-  tstrncpy(connReq.user, TSDB_DEFAULT_USER, sizeof(connReq.user));
-  char pass[TSDB_PASSWORD_LEN + 1] = {0};
-  taosEncryptPass_c((uint8_t *)(TSDB_DEFAULT_PASS), strlen(TSDB_DEFAULT_PASS), pass);
-  tstrncpy(connReq.passwd, pass, sizeof(connReq.passwd));
-  connReq.pid = taosGetPId();
-  connReq.startTime = taosGetTimestampMs();
-  strcpy(connReq.sVer, version);
-
-  int32_t contLen = tSerializeSConnectReq(NULL, 0, &connReq);
-  void   *pReq = rpcMallocCont(contLen);
-  tSerializeSConnectReq(pReq, contLen, &connReq);
-
-  SUdfdRpcSendRecvInfo *msgInfo = taosMemoryCalloc(1, sizeof(SUdfdRpcSendRecvInfo));
-  msgInfo->rpcType = UDFD_RPC_MNODE_CONNECT;
-  uv_sem_init(&msgInfo->resultSem, 0);
-
-  SRpcMsg rpcMsg = {0};
-  rpcMsg.msgType = TDMT_MND_CONNECT;
-  rpcMsg.pCont = pReq;
-  rpcMsg.contLen = contLen;
-  rpcMsg.info.ahandle = msgInfo;
-  rpcSendRequest(global.clientRpc, &global.mgmtEp.epSet, &rpcMsg, NULL);
-
-  uv_sem_wait(&msgInfo->resultSem);
-  int32_t code = msgInfo->code;
-  uv_sem_destroy(&msgInfo->resultSem);
-  taosMemoryFree(msgInfo);
-  return code;
-}
-
 static bool udfdRpcRfp(int32_t code, tmsg_t msgType) {
   if (code == TSDB_CODE_RPC_NETWORK_UNAVAIL || code == TSDB_CODE_RPC_BROKEN_LINK || code == TSDB_CODE_SYN_NOT_LEADER ||
       code == TSDB_CODE_RPC_SOMENODE_NOT_CONNECTED || code == TSDB_CODE_SYN_RESTORING ||
@@ -1378,23 +1344,6 @@ static int32_t udfdRun() {
   return 0;
 }
 
-void udfdConnectMnodeThreadFunc(void *args) {
-  int32_t retryMnodeTimes = 0;
-  int32_t code = 0;
-  while (retryMnodeTimes++ <= TSDB_MAX_REPLICA) {
-    uv_sleep(100 * (1 << retryMnodeTimes));
-    code = udfdConnectToMnode();
-    if (code == 0) {
-      break;
-    }
-    fnError("udfd can not connect to mnode, code: %s. retry", tstrerror(code));
-  }
-
-  if (code != 0) {
-    fnError("udfd can not connect to mnode");
-  }
-}
-
 int32_t udfdInitResidentFuncs() {
   if (strlen(tsUdfdResFuncs) == 0) {
     return TSDB_CODE_SUCCESS;
@@ -1497,9 +1446,6 @@ int main(int argc, char *argv[]) {
 
   udfdInitResidentFuncs();
 
-  uv_thread_t mnodeConnectThread;
-  uv_thread_create(&mnodeConnectThread, udfdConnectMnodeThreadFunc, NULL);
-
   udfdRun();
 
   removeListeningPipe();
diff --git a/tests/script/tsim/query/udf.sim b/tests/script/tsim/query/udf.sim
index e539f11531..fbf9d50c25 100644
--- a/tests/script/tsim/query/udf.sim
+++ b/tests/script/tsim/query/udf.sim
@@ -8,6 +8,9 @@ system sh/deploy.sh -n dnode1 -i 1
 system sh/cfg.sh -n dnode1 -c udf -v 1
 system sh/exec.sh -n dnode1 -s start
 sql connect
+sql alter user root pass 'taosdata2'
+system sh/exec.sh -n dnode1 -s stop
+system sh/exec.sh -n dnode1 -s start
 
 print ======== step1 udf
 system sh/compile_udf.sh