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Hi<br />
<br />
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.<br />
<br />
Thank you.
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Hi

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.

DNS Open Resolver issue

The Domain Name System (DNS) is a hierarchical, globally distributed system responsible for associating the name of a computer, service or other resource into an IP address for connecting to the Internet or a private network. Most prominently, it translates domain names to the numerical IP addresses needed for the purpose of computer services and devices worldwide.

Small Business Server (SBS) is a line of server operating systems targeted at small businesses by bundling the operating system with a number of other Microsoft products that would normally need to be purchased or licensed separately. The most notable inclusions are Exchange, SQL Server, SharePoint and ISA/TMG (Microsoft's firewall and proxy server).

The Internet Protocol (IP) is the principal communications protocol in the Internet protocol suite for relaying datagrams across network boundaries, organized in abstraction layers, traditionally called "Link," "Internet," "Transport" and "Application”. Its routing function enables internetworking, and essentially establishes the Internet. IP defines packet structures that encapsulate the data to be delivered. It also defines addressing methods that are used to label the datagram with source and destination information.