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Community.letsencrypt.org news digest

  • 0 days

    Dns-persist-01 challenge

    Perhaps tangential, but, this is a bit confusing for a "persistent" method. The ACME Client may not have to provision a TXT record at all if one preexists.
    Challenge Response and Verification
    To respond to the challenge, the ACME client provisions a DNS TXT record for the Authorization Domain Name being validated....

  • 0 days

    Dns-persist-01 challenge

    Thank you for all your insightful feedback!
    At first, caaIdentities seemed promising, but the "MAY" in the draft makes much more sense now.
    Therefore, the only reliable method is to extract the domain names from the challenge object.

  • 0 days

    SERVFAIL errors on CAA checks (primarily when including many SANs)

    I don't know how actionable or related this is, but both DNSViz and the ISC EDNS Tester report issues, including timeouts, and you may have a path MTU issue.
    nmdp.org/TXT: No response was received until the UDP payload size was decreased, indicating that the server might be attempting to send a payload that exceeds the path maximum transmission unit (PMTU) size. See RFC 6891, Sec. 6.2.6. (192.230.121.1, ...

  • 0 days

    SERVFAIL errors on CAA checks (primarily when including many SANs)

    The sporadic nature of the problem feels like some sort of load-related DoS protection trigger either at the Imperva or the Infoblox layer. Too many queries from the same IPs too quickly triggering a temporary block.

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