I believe you're seeing this error message because you're trying to run Microsoft's Internet Connection Sharing (ICS) service on the same computer that's running your name server. ICS automatically starts a DNS proxy (the one mentioned in the error message) to relay local clients' DNS queries to the Internet. But the DNS proxy listens on the same UDP and TCP ports that the name server uses, which is a no-no in TCP/IP networking. So you'll have to disable ICS on this computer to make the error go away.
Related Q&A from Cricket Liu
If you take some simple steps, you can help prevent advanced persistent threats from plaguing your network.continue reading
How to add an SPF record on Windows 2000 DNS Server to counter "Your domain does not have an SPF record" warning message.continue reading
Have a question for an expert?
Please add a title for your question
Get answers from a TechTarget expert on whatever's puzzling you.