diff --git a/src/rpc/src/rpcMain.c b/src/rpc/src/rpcMain.c
index c2bebaeee6cc21acab197e92b77358ddba42b0ff..ddc5b2de3730ef2e0e76bca9660643a5d9a977aa 100644
--- a/src/rpc/src/rpcMain.c
+++ b/src/rpc/src/rpcMain.c
@@ -963,9 +963,14 @@ static SRpcConn *rpcProcessMsgHead(SRpcInfo *pRpc, SRecvInfo *pRecv, SRpcReqCont
     terrno = TSDB_CODE_RPC_INVALID_SESSION_ID; return NULL;
   }
 
-  if (rpcIsReq(pHead->msgType) && htonl(pHead->msgVer) != tsVersion >> 8) {
-    tDebug("%s sid:%d, invalid client version:%x/%x %s", pRpc->label, sid, htonl(pHead->msgVer), tsVersion, taosMsg[pHead->msgType]);
-    terrno = TSDB_CODE_RPC_INVALID_VERSION; return NULL;
+  // compatibility between old version client and new version server, since 2.4.0.0
+  if (rpcIsReq(pHead->msgType)){
+    if((htonl(pHead->msgVer) >> 16 != tsVersion >> 24) ||
+        ((htonl(pHead->msgVer) >> 16 == tsVersion >> 24) && htonl(pHead->msgVer) < ((2 << 16) | (4 << 8)))){
+      tError("%s sid:%d, invalid client version:%x/%x %s", pRpc->label, sid, htonl(pHead->msgVer), tsVersion, taosMsg[pHead->msgType]);
+      terrno = TSDB_CODE_RPC_INVALID_VERSION;
+      return NULL;
+    }
   }
 
   pConn = rpcGetConnObj(pRpc, sid, pRecv);
@@ -983,7 +988,8 @@ static SRpcConn *rpcProcessMsgHead(SRpcInfo *pRpc, SRecvInfo *pRecv, SRpcReqCont
 
   sid = pConn->sid;
   if (pConn->chandle == NULL) pConn->chandle = pRecv->chandle;
-  pConn->peerIp = pRecv->ip; 
+  pConn->peerIp = pRecv->ip;
+
   pConn->peerPort = pRecv->port;
   if (pHead->port) pConn->peerPort = htons(pHead->port);