if (url.startsWith("ncacn_np:")) {
            return new DcerpcPipeHandle(url, auth);
        }
        throw new DcerpcException("DCERPC transport not supported: " + url);
    }

    public void bind() throws DcerpcException, IOException {
synchronized (this) {
        try {
            state = 1;
            DcerpcMessage bind = new DcerpcBind(binding, this);
            sendrecv(bind);