Hi, We provide a service that orders certificates from Let’s Encrypt. We use the Lego library for ACME operations. We have end-to-end tests that cover our certificate ordering flows and run daily. Today, these tests started failing, although both the tests and the service code are old and were not…

I have contacted LE staff to look into things. (2)

We are getting same errors since today.

"Dehydrated" Client shows also errors with 404 for cert creation: + Signing domains... + Generating private key... + Generating signing request... + Requesting new certificate order from CA... + ERROR: An error occurred while sending post-request to https://acme-v02.api.letsencrypt.org/acme/…

We got the same spike of 404 responses on multiple requests, mostly on get-authorization endpoint

Same kinds of errors here. ERROR: An error occurred while sending post-request to https://acme-v02.api.letsencrypt.org/acme/authz/1270118326/715481696466 (Status 404) Details: HTTP/1.0 200 Connection Established HTTP/2 404 server: nginx date: Wed, 03 Jun 2026 09:13:08 GMT content-type: appli…

We are seeing the same issue from our ACME client today. The first occurrence on our side was at around 07:54 local time (Europe/Vienna, CEST), and since then we have seen the error dozens of times across different domains/orders. There were no deployment or infrastructure changes on our side. Typ…

Same started to happen for us since ~05:35 GMT: No such challenge Failed to find authorization for domain

same error. i am using pdns-acme and dns-01 challenge for generating certs. from about 1hour ago i get such as 404 errors :slight_smile:

No such authorization No order for ID 517.... Not Found

We are seeing this too, and some urn:ietf:params:acme:error:connection errors mixed in. First uptick ~3 hours ago. Appears on 100% of requests now. Appears to be some kind of issue on LE's end. Its not an issue you can retry your way out of either, 20 retries (one every 2s) "Force renewa…

It is > imagineable < , that it's related to the latest nginx exploit patches.. may be it's a nginx meltdown.

ACME 404 errors for existing end-to-end tests: “No such authorization” / “Certificate not found”

Help

gshumakher June 3, 2026, 9:31am 8

Same started to happen for us since ~05:35 GMT:

No such challenge
Failed to find authorization for domain

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ACME 404 errors for existing end-to-end tests: “No such authorization” / “Certificate not found”

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