Second DNSSEC screw-up takes down Aussie web sites

.au domains failed to resolve for many internet users for almost an hour on Monday, after the registry operator messed up a DNSSEC update.

ccTLD overseer auDA said the issue was caused by a “key re-signing process that generated an incorrect record”. Users on ISPs that strictly enforce DNSSEC would have returned not-found errors for .au domains during the outage.

.au’s technical back-end is managed by Identity Digital, which reportedly said that the outage lasted from 0005 UTC until 0052 UTC.

With over four million domains, .au is I believe the largest TLD zone to fall victim to DNSSEC-related downtime, but it’s not the first time it has happened to the domain.

In March 2022, thousands of .au domains were affected by a DNSSEC snafu that lasted a few hours.

DNSSEC is meant to make the DNS more secure by reducing the risk of man-in-the-middle attacks, but it’s appears to be easy to screw up, judging by a list of TLD outages. Just this year, Mexico, New Zealand and Venezuela have also suffered downtime.

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