Letsencrypt is going to revoke 3,048,289 certificates tomorrow that "may" have been wrongfully issued due to a wrong CAA DNS check.

To check if you're affected, and need to re-issue certs (before tomorrow!), check here:

letsencrypt.org/caaproblem/

Follow

@dansup as easy way to check for invalid domains with letsencrypt: $ curl -d 'fqdn=example.com' checkhost.unboundtest.com/chec

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