protected void NoSuchSA(int spi, ISender remote_sender) {
SecurityControlMessage scm_reply = new SecurityControlMessage();
scm_reply.Version = Version;
scm_reply.SPI = spi;
scm_reply.Type = SecurityControlMessage.MessageType.NoSuchSA;
ICopyable to_send = new CopyList(Security, SecureControl, scm_reply.Packet);
remote_sender.Send(to_send);
}