Acme error 400: Timeout during connect

Hi, I need help to understand what’s wrong with my domain I’m using Traefik Helm chart with the tls-alpn-01 challenge. It’s not the first time when I do so and usually it works. But now I’m getting the following error:

“level”: “error”,
“msg”: “Unable to obtain ACME certificate for domains “” detected thanks to rule “” : unable to generate a certificate for the domains []: acme: Error -> One or more domains had a problem:\n[] acme: error: 400 :: urn:ietf:params:acme:error:connection :: Timeout during connect (likely firewall problem), url: \n”,
“time”: “2020-02-12T10:33:17Z”

I’m out of ideas what can be wrong. Would appreciate any help.

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I can’t reproduce the same timeout against your domain (using the TLS-ALPN challenge) using either the staging or live ACME servers.

Is it still happening if you try right now?

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Just retried. The same error message.


Let’s Encrypt can definitely access your server on the TLS-ALPN when I try:

When you are deploying Traefik, is it trying to issue certificates for many domains, or just this one? I wonder if it is triggering some kind of firewall/connection limit to your cluster.

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It looks like something wrong with Traefik itself. Here’s the response from letsencrypt API in my case:

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