modifier.setFrom( requestedStartTime );
KerberosTime requestedEndTime = new KerberosTime( now + 2 * KerberosTime.DAY );
modifier.setTill( requestedEndTime );
RequestBody requestBody = modifier.getRequestBody();
KdcRequest message = getKdcRequest( tgt, requestBody );
handler.messageReceived( session, message );
TicketGrantReply reply = ( TicketGrantReply ) session.getMessage();