Query Cache Denied Errors

We have a couple internal name servers setup where we are seeing errors like
the following in the security log file we have configured. What is/can be
causing this error and what can be done to stop them, if anything. If
configuration files or any further info is needed, I can provide that
information.
Bill Smith

<mailto:bill.smith@jhuapl.edu <mailto:bill.smith@jhuapl.edu>
ISS Systems Server Group
Johns Hopkins University Applied Physics Laboratory
11100 Johns Hopkins Road
Laurel, MD 20723
Phone: 443-778-5523
Web: http://www.jhuapl.edu <http://www.jhuapl.edu>


Jul 21 08:54:04.757 info: client 128.244.58.238#1141: query (cache) denied
Jul 21 08:54:04.880 info: client 128.244.58.238#1143: query (cache) denied
Jul 21 08:54:04.926 info: client 128.244.58.238#1146: query (cache) denied
Jul 21 08:54:05.531 info: client 128.244.58.238#1148: query (cache) denied
Jul 21 08:54:05.534 info: client 128.244.58.238#1149: query (cache) denied
Jul 21 08:56:33.026 info: client 128.244.58.238#1152: query (cache) denied
Jul 21 08:56:33.030 info: client 128.244.58.238#1153: query (cache) denied
Jul 21 08:57:15.337 info: client 128.244.58.238#1159: query
'spaceweb.jhuapl.edu
/IN' denied
Jul 21 08:59:43.333 info: client 128.244.58.238#1184: query (cache) denied
Jul 21 08:59:43.336 info: client 128.244.58.238#1185: query (cache) denied