KRB5 OID: 1.2.840.113554.1.2.2 (KRB5 - Kerberos 5)
        krb5_tok_id: KRB5_AP_REQ (0x0001)
        Kerberos
            ap-req
                pvno: 5
                msg-type: krb-ap-req (14)
                Padding: 0
                ap-options: 20000000
                ticket
                    tkt-vno: 5
                    realm: W2K19SINGLE.SPRINGFIELD
                    sname

        }
        else {
            req.setMid(0);
            this.mid.set(1);
        }
        int n = req.encode(this.sbuf, 4);
        Encdec.enc_uint32be(n & 0xFFFF, this.sbuf, 0); /* 4 byte ssn msg header */

        if ( log.isTraceEnabled() ) {
            log.trace(req.toString());
            log.trace(Hexdump.toHexString(this.sbuf, 4, n));
        }

        this.out.write(this.sbuf, 0, 4 + n);