bind9 “query denied” dan “query (cache) denied”

Pagi ini iseng2 aq mengamati /var/log/syslog, ternyata banyak sekali tulisan spt ini :

Jun 22 05:06:50 eleanor named[15975]: client 10.122.1.55#1027: query (cache) 'time.windows.com/A/IN' denied
Jun 22 05:55:08 eleanor named[3926]: client 10.122.1.55#1122: query (cache) 'athena.its.ac.id/A/IN' denied
Jun 22 06:04:45 eleanor named[4195]: client 127.0.0.1#39467: query 'dynamic-ip-adsl-190.186.23.61.cotas.com.bo.ee.its.ac.id/A/IN' denied
Jun 22 06:04:45 eleanor named[4195]: client 202.46.129.134#39467: query 'dynamic-ip-adsl-190.186.23.61.cotas.com.bo.ee.its.ac.id/A/IN' denied
Jun 22 06:07:44 eleanor named[4552]: client 10.122.1.55#1226: query (cache) 'gmail.com/A/IN' denied
Jun 22 06:11:05 eleanor named[4713]: client 74.6.17.154#52328: query 'www.ee.its.ac.id/A/IN' denied