How do I close an open DNS Server

I have received an email from my internet provider stating I have an open DNS Server and my network has been used to attack other networks (DOS) Denial of service. I can't figure out how to secure my network. or close the open DNS server.

You should at least update your Mac to 10.6.8 although I am not sure there are any particular security issues that would be there.
Of course running later OS is always better.. as the latest security updates are implemented in the most recent OS.. but I am not sure one follows the other as some weaknesses are introduced as well in later OS. Any security updates should certainly be installed.
The main point is what modem and what router do you have?
There are a number of these notices being sent to users with apple routers which are hard to believe can be involved. It is more likely the ISP equipment. But we cannot really help you with exact details of your network .. or any more precise details the ISP has given you.
Ring up and talk to their technical help dept. and ask for their help. Even if they won't help you fix apple router.. put the modem in router mode or buy a new modem with router mode and change the apple router to bridge.. then the issue is not caused by you and the ISP can remotely adjust their own box.

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Message was edited by: cscrofani

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