找到了, 设置的缓存不够用了

找到原因了, SDK 出现了错误
//wm_sck_server_demo. c
//static int create_socket_server (int port)
if (new_fd ! = -1)
{
printf ("shutting down socket and restaring. . . n") ;
shutdown (new_fd, 0) ;
closesocket (new_fd) ;
//添加
closesocket (server_fd) ;
}