diff --git a/cpp/protoutils.cc b/cpp/protoutils.cc
index 59d8a9e..90b0cea 100644
--- a/cpp/protoutils.cc
+++ b/cpp/protoutils.cc
@@ -197,18 +197,19 @@ namespace f8
         int packlen = msg.ByteSize();
         assert(packlen < 1024 * 60);
 
-        char* buff = (char*)malloc(sizeof(WSProxyPackHead_S) + packlen);
+        char* buff = (char*)malloc(sizeof(WSProxyPackHead_C) + packlen);
+        memset(buff, 0, sizeof(WSProxyPackHead_C));
         WSProxyPackHead_C* head = (WSProxyPackHead_C*)buff;
         head->packlen = packlen;
         head->msgid = msgid;
         head->seqid = 0;
         head->magic_code = MAGIC_CODE;
-        #if 0
-        head->rpc_error_code = 0;
-        #endif
+        head->ip_saddr = 0;
         head->socket_handle = socket_handle;
 
-        msg.SerializeToArray(buff + sizeof(WSProxyPackHead_C), packlen);
+        if (packlen > 0) {
+            msg.SerializeToArray(buff + sizeof(WSProxyPackHead_C), packlen);
+        }
         tcp_client->SendBuff(buff, sizeof(WSProxyPackHead_C) + packlen);
         free(buff);
         return sizeof(WSProxyPackHead_C) + packlen;