[AusNOG] Global DNS yuck?

[Lachlan Gilmour]

I believe it is related to the Lets Encrypt root cert that expired
overnight.

I've seen quite a few older devices today having issues accessing sites
using lets encrypt certs.

More info on the issue can be found here:
https://docs.certifytheweb.com/docs/kb/kb-202109-letsencrypt/

On Fri, Oct 1, 2021 at 12:36 PM Mark Andrews <marka at isc.org> wrote:

> More correctly they had working DNSSEC deployed (
> https://dnsviz.net/d/slack.com/YVXX_g/dnssec/) and then pulled both the
> DS records for slack.com and the DNSSEC records in slack.com AT THE SAME
> TIME resulting in DNSSEC validation failures. Cached DS records said
> slack.com is signed but the answers from the slack.com servers where
> missing the DNSSEC records. They failed to wait for the DS records to
> expire from DNS caches before removing the DNSSEC records in slack.com.
> Failure to wait for unsigned responses to clear caches before publishing DS
> records can also cause issues with multiple levels of caching.
>
> > On 1 Oct 2021, at 08:23, Scott Howard <scott at doc.net.au> wrote:
> >
> > They broke (and subsequently fixed) their DNSSEC configuration many
> hours ago, but it was broken long enough to get cached by some servers for
> up to 24 hours so some users are still having issues connecting.
> >
> > Short of the classic "have your ISP clear their DNS cache" not much
> anyone can do except wait it out...
> >
> > https://status.slack.com/2021-09/06c1e17de93e7dc2
> >
> >   Scott
> >
> >
> > On Thu, Sep 30, 2021 at 3:19 PM Andrew Yager <andrew at rwts.com.au> wrote:
> > Hi,
> >
> > Slack is down and finding a few other (non slack) services etc being
> broken seemingly with DNS things. Anyone know what’s going on?
> >
> > A
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>
> --
> Mark Andrews, ISC
> 1 Seymour St., Dundas Valley, NSW 2117, Australia
> PHONE: +61 2 9871 4742              INTERNET: marka at isc.org
>
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-- 

Lachlan Gilmour


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