RPC_CANCEL_ACK 926 source3/rpc_server/srv_pipe.c init_rpc_hdr(&ack_reply_hdr, RPC_CANCEL_ACK, RPC_FLG_FIRST | RPC_FLG_LAST, RPC_CANCEL_ACK 559 source3/rpc_server/srv_pipe_hnd.c case RPC_CANCEL_ACK: