This command clears all open UDP ports by DNS.EXE
net stop dns
After restarting the DNS service, DNS.EXE allocates 5000+ ports.
net start dns
It doesn't consume extensive memory or cpu. However I noticed/alarmed many http/smtp/pop3 connection problems to the server because of timeouts. I just examined and found tons of open ports by DNS.EXE. Currports displays UDP local ports from 50000 to 56000, local addresses are :: and remote addresses are empty. Last lines of netstat - a command are below:
UDP [::]:55976 *:* UDP [::]:55977 *:* UDP [::]:55978 *:* UDP [::]:55979 *:* UDP [::]:55980 *:* UDP [::]:55981 *:* UDP [::]:55982 *:*
I didn't notice these ports before, so I don't know for sure it is ok or not. What do you think? I did restart the server and monitoring/alert mails are NOT continuing.