libmemcached调用memcached_set会connection failed 原因？

服务已经开启
root 12217 1 0 13:53 ? 00:00:00 /usr/local/bin/memcached -d -m 10 -u root -l 192.168.107.200 -p 6500 -c 256 -vv -P /tmp/memcached.pid

程序代码
#include
#include
#include
#include

int main(int argc, char *argv[])
{
memcached_server_st *servers = NULL;
memcached_st *memc;
memcached_return rc;
char *key= "keystring";
char *value= "keyvalue";

servers=memcached_servers_parse("127.0.0.1:6500");
memc= memcached_create(NULL);

servers= memcached_server_list_append(servers, "localhost", 11211, &rc);
rc= memcached_server_push(memc, servers);

if (rc == MEMCACHED_SUCCESS)
fprintf(stderr,"Added server successfully\n");
else
fprintf(stderr,"Couldn't add server: %s\n",memcached_strerror(memc, rc));

rc= memcached_set(memc, key, strlen(key), value, strlen(value), (time_t)0, (uint32_t)0);

if (rc == MEMCACHED_SUCCESS)
fprintf(stderr,"Key stored successfully\n");
else
fprintf(stderr,"Couldn't store key: %s\n",memcached_strerror(memc, rc));

return 0;
}

调试之后rc返回值是MEMCACHED_FAILED

你命令，服务器绑定的192.168.107.200

memcached -d -m 10 -u root -l 192.168.107.200

而代码用的127.0.0.1，两个不一致

 servers=memcached_servers_parse("127.0.0.1:6500");
 memc= memcached_create(NULL);

servers= memcached_server_list_append(servers, "localhost", 11211, &rc);