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I have a VPS server that I host several sites on. One of the domain names I use for a site hosted on the VPS is registered through a different company, Host Gator. The site was working fine until this morning when it randomly went down. After hours of talking to Host Gator support, they decided that the problem was I did not have an A record for "NS1" and "NS2" pointing to my name server's ip addresses and they claimed the absence of those A records are why the site went down.

I have never heard of needing an A record for "NS1" and "NS2" before. I am confused as to why the site would work just fine without the A records and then suddenly go down when no DNS changes were previously made. Could someone explain this to me?

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Perhaps is a better fit for this type of question. – Kenny Rasschaert Jan 23 '13 at 20:43
Oh ok cool. Thanks for the suggestion! – user715564 Jan 23 '13 at 20:54
Most likely, the name servers were previously being found just by glue records. – David Schwartz Jan 23 '13 at 20:59
But what would cause the site to do down? I mean, why would the A records "NS1" and "NS2" suddenly be required? – user715564 Jan 23 '13 at 21:02
@user715564: They were always required. The thing to try to explain is how it was working before. (Hence my comment.) – David Schwartz Jan 23 '13 at 22:00

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