Q: somebody queried and constantly switching ports

[Bob Marcan]

challv1 2% tail /var/adm/SYSLOG
Jan 20 11:10:01 5D:challv1 named[4270]: refused query on non-query
socket from [172.21.2.50].1635
Jan 20 11:10:07 5D:challv1 named[4270]: refused query on non-query
socket from [172.21.2.50].1636
Jan 20 11:10:12 5D:challv1 named[4270]: refused query on non-query
socket from [172.21.2.50].1637
Jan 20 11:10:17 5D:challv1 named[4270]: refused query on non-query
socket from [172.21.2.50].1638
Jan 20 11:10:22 5D:challv1 named[4270]: refused query on non-query
socket from [172.21.2.50].1639
Jan 20 11:10:33 5D:challv1 named[4270]: refused query on non-query
socket from [172.21.2.50].1640
Jan 20 11:10:41 5D:challv1 named[4270]: refused query on non-query
socket from [172.21.2.50].1641
Jan 20 11:10:47 5D:challv1 named[4270]: refused query on non-query
socket from [172.21.2.50].1642
Jan 20 11:10:52 5D:challv1 named[4270]: refused query on non-query
socket from [172.21.2.50].1643
challv1 3% 

172.21.2.50 probably .eq. Windoze

Can somebody explain what's going on?

TIA, Bob