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One of my test apps asks public google DNS server to resolve some SIP providers IPs. And periodically I receive SERVFAIL for no particular reason for a short period of time. While asked directly, domain's nameserver properly answers query. Following is a response packet from google:

enter image description here

Any ideas why this can happen?

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  • Too much connections to 8.8.8.8 from this IP ?
    – Dom
    Nov 27, 2015 at 9:10
  • I have the same issue.
    – benmmurphy
    Dec 14, 2016 at 18:03

1 Answer 1

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Google Public DNS performs DNSSEC validation for all DNS queries by default. When a nameserver fails DNSSEC validation, Google Public DNS returns SERVFAIL.

https://developers.google.com/speed/public-dns/docs/troubleshooting

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    That does not explain why they give SERVFAIL for domains that do not have (and have never had) DNSSEC active. Which they have been doing irritatingly often in the past couple of months. Nov 28, 2015 at 11:51

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