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I run DNS server and host few websites (example -

All websites run fine and its whois points to and

However I can't ping anymore. It happened after my server was powered up yesterday (power outage in COLO4 Dallas data center).

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Firstly, kudos for actually providing real domains. It makes the diagnosis much easier.

Running over the record in question says:

50.0% of queries will end in failure at ( - returned SERVFAIL code

50.0% of queries will end in failure at ( - returned SERVFAIL code

I'm going to take a wild stab in the dark and guess that you've put both your DNS servers on the one machine, and now you've just learnt why that is a phenomenally bad idea. There are whole RFCs dedicated to why that is a bad idea.

As to why your DNS server has suddenly decided to fail all queries, that's beyond me because you haven't provided any diagnostically relevant information on that aspect of things. Take a stab at it yourself, but if you can't figure it out you'll need to provide your DNS server software, version, and relevant-looking log messages (but probably ask a separate question as it'll get too confusing in this one).

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i got it that my DNS config is bad, i was just trying for now to figure out is it possible that is working while its nameservers wouldn't ping 2.what (theoretically) could cause it to stop working – michaelb Aug 12 '11 at 4:19
1. Because the glue records mean that the resolver is never actually authoritatively resolving the nameservers; 2. Lots of things, that's why you should ask a question with what server you're using and your logs, like I said in my answer. – womble Aug 12 '11 at 7:20

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