DNS queries to root servers
Posted on 2003-02-24
We have a Windows 2000 Small Business Server with DNS running for Active Directory. It connects to the internet through a Cisco ISDN router and we've noticed that it's connecting to the internet periodically with DNS requests. This happens during the night and we've eliminated all of the PCs on the network as the cause, so it's definitely the server. We've ran Ad-Aware to remove all Spy-ware from the network so it doesn't look like spyware is the cause.
There are two forwarders configured for our ISP, and we've disabled the server's network card from registering it's address in DNS. The time to live value in DNS has been changed to 1 day.
We've also re-applied Service Pack 3, but we still get over an hour's worth of dialing through the night.
Can anyone suggest why the internet connection is being opened through the night? We've gone through as many settings as we could think of and have managed to bring the total time down from connecting every 5 mins to connecting for a total time of one hour overnight.
Thanks in advance for any input.