final int reqLen = negotiateWrite(smb2neg, first != null);
            final boolean doPreauth = getContext().getConfig().getMaximumVersion().atLeast(DialectVersion.SMB311);
            if (doPreauth) {
                negoReqBuffer = new byte[reqLen];
                System.arraycopy(this.sbuf, 4, negoReqBuffer, 0, reqLen);
            }

            negotiatePeek();