DNS Open Resolver issue


I have a problem, one of my clients Windows Small Business Server 2008 has an open DNS resolver, I have being informed by the ISP Abuse department that I need to shut down the open DNS Resolver, and that it is created by some kind of attack. I disabled the DNS recursion, but this disables the forwarders and subsequently all access to the Internet. I am no DNS expert, any and all help would be greatly appreciated.

Thank you.
Who is Participating?
Emmanuel AdebayoConnect With a Mentor Global Windows Infrastructure Engineer - ConsultantCommented:
skullnobrainsConnect With a Mentor Commented:
the problem is not that recursion is enabled.

somehow you are providing dns services to the outside world.
if you are not hosting a dns zone, you can firewall port 53, otherwise you need to configure your dns server to reject queries from wan clients except for the zone you are hosting
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