diff --git a/src/inc/taoserror.h b/src/inc/taoserror.h
index 58e19ce52af1402ab34f073c3ed3262bcab00092..7c7e7ec31ab88a1f048767b9cc4aa486bfa788cd 100644
--- a/src/inc/taoserror.h
+++ b/src/inc/taoserror.h
@@ -272,6 +272,7 @@ TAOS_DEFINE_ERROR(TSDB_CODE_SYN_MISMATCHED_CLUSTERID,     0, 0x0906, "Mismatched
 TAOS_DEFINE_ERROR(TSDB_CODE_SYN_MISMATCHED_SIGNATURE,     0, 0x0907, "Mismatched signature")
 TAOS_DEFINE_ERROR(TSDB_CODE_SYN_INVALID_CHECKSUM,         0, 0x0908, "Invalid msg checksum")
 TAOS_DEFINE_ERROR(TSDB_CODE_SYN_INVALID_MSGLEN,           0, 0x0909, "Invalid msg length")
+TAOS_DEFINE_ERROR(TSDB_CODE_SYN_INVALID_MSGTYPE,          0, 0x090A, "Invalid msg type")
 
 // wal
 TAOS_DEFINE_ERROR(TSDB_CODE_WAL_APP_ERROR,                0, 0x1000, "Unexpected generic error in wal")
diff --git a/src/sync/src/syncMain.c b/src/sync/src/syncMain.c
index bf0b6e95d487c16b6a72221cc4ea5ee95c9e0824..e84de62368b910e9e4be42634bf4302ad999de2a 100644
--- a/src/sync/src/syncMain.c
+++ b/src/sync/src/syncMain.c
@@ -851,25 +851,17 @@ static void syncProcessFwdResponse(SFwdRsp *pFwdRsp, SSyncPeer *pPeer) {
   sTrace("%s, forward-rsp is received, code:%x hver:%" PRIu64, pPeer->id, pFwdRsp->code, pFwdRsp->version);
   SFwdInfo *pFirst = pSyncFwds->fwdInfo + pSyncFwds->first;
 
-  bool found = false;
   if (pFirst->version <= pFwdRsp->version && pSyncFwds->fwds > 0) {
     // find the forwardInfo from first
     for (int32_t i = 0; i < pSyncFwds->fwds; ++i) {
       pFwdInfo = pSyncFwds->fwdInfo + (i + pSyncFwds->first) % tsMaxFwdInfo;
       if (pFwdRsp->version == pFwdInfo->version) {
-        found = true;
         syncProcessFwdAck(pNode, pFwdInfo, pFwdRsp->code);
         syncRemoveConfirmedFwdInfo(pNode);
-        break;
+        return;
       }
     }
   }
-
-  if (!found) {
-    sTrace("%s, forward-rsp not found first:%d fwds:%d, code:%x hver:%" PRIu64, pPeer->id, pSyncFwds->first,
-           pSyncFwds->fwds, pFwdRsp->code, pFwdRsp->version);
-    syncProcessFwdAck(pNode, pFwdInfo, pFwdRsp->code);
-  }
 }
 
 static void syncProcessForwardFromPeer(char *cont, SSyncPeer *pPeer) {
@@ -1192,7 +1184,7 @@ static void syncProcessFwdAck(SSyncNode *pNode, SFwdInfo *pFwdInfo, int32_t code
   }
 
   if (confirm && pFwdInfo->confirmed == 0) {
-    sTrace("vgId:%d, forward is confirmed, hver:%" PRIu64 " code:%x", pNode->vgId, pFwdInfo->version, pFwdInfo->code);
+    sTrace("vgId:%d, forward is confirmed, hver:%" PRIu64 " code:0x%x", pNode->vgId, pFwdInfo->version, pFwdInfo->code);
     (*pNode->confirmForward)(pNode->vgId, pFwdInfo->mhandle, pFwdInfo->code);
     pFwdInfo->confirmed = 1;
   }
diff --git a/src/sync/src/syncMsg.c b/src/sync/src/syncMsg.c
index dafefc77baab736be646651d6e504d83553a3029..7ca96e86baabab35e0c0b30a950780962a26ae72 100644
--- a/src/sync/src/syncMsg.c
+++ b/src/sync/src/syncMsg.c
@@ -47,6 +47,7 @@ int32_t syncCheckHead(SSyncHead *pHead) {
   if (pHead->signature != SYNC_SIGNATURE) return TSDB_CODE_SYN_MISMATCHED_SIGNATURE;
   if (pHead->cId != 0) return TSDB_CODE_SYN_MISMATCHED_CLUSTERID;
   if (pHead->len <= 0 || pHead->len > TSDB_MAX_WAL_SIZE) return TSDB_CODE_SYN_INVALID_MSGLEN;
+  if (pHead->type <= TAOS_SMSG_START || pHead->type >= TAOS_SMSG_END) return TSDB_CODE_SYN_INVALID_MSGTYPE;
   if (!taosCheckChecksumWhole((uint8_t *)pHead, sizeof(SSyncHead))) return TSDB_CODE_SYN_INVALID_CHECKSUM;
 
   return TSDB_CODE_SUCCESS;