For those of you who check your nameservers and other DNS related issues using dnsstuff (now that it is a paid version, you can goto IntoDNS and still check for free), you’re probably seeing Fail Open DNS Servers. We’ll show you have to fixed named to close open dns servers.How do I check my system?
Go to IntoDNS and enter your domain name, eg yoursite.com
You’re safe if you see: PASS Open DNS servers
You need to follow this tutorial if you see: FAIL Open DNS servers
Closing Open DNS Servers Tutorial
1) Login to your server and su to root.