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

            negotiatePeek();