OneLinersCommand workbench
Verified diagnostic signature

Failed authorization procedure

The ACME certificate authority could not prove control of at least one requested name. Match this output from certbot, then continue with sourced, read-only checks.

Confidence
high
Platforms
linux
Verified
2026-07-24
Recognized output

Signature matched locally

Failed authorization procedure

OneLiners matches this pattern in your browser. Your pasted output is not stored or indexed.

Likely causes

What usually produces this signal

  1. Public A or AAAA records reach the wrong server, address, proxy, or virtual host
  2. TCP port 80 or the HTTP-01 challenge path is blocked, redirected incorrectly, or rewritten
  3. DNS-01 TXT data is absent, stale, published in the wrong zone, or not visible from every authoritative server
  4. CAA, DNSSEC, split DNS, or authoritative DNS availability prevents validation
Safe next checks

Collect evidence before changing the system

01

Resolve a hostname to its IP address

dig +short <domain>

The output matches the expected target and exits without an error.

02

Fetch only the HTTP response headers

curl -I <url>

The output matches the expected target and exits without an error.

03

Check whether a TCP port accepts connections

nc -vz <host> <port>

The output matches the expected target and exits without an error.

04

Inspect a remote TLS certificate

openssl s_client -connect <host>:<port> -servername <host> </dev/null 2>/dev/null | openssl x509 -noout -subject -issuer -dates

The output matches the expected target and exits without an error.

Related signals

Other output patterns from this error family

certbot.errors.AuthorizationErrorThe ACME certificate authority could not prove control of at least one requested name.Some challenges have failedThe ACME certificate authority could not prove control of at least one requested name.Certbot failed to authenticate some domainsThe ACME certificate authority could not prove control of at least one requested name.urn:ietf:params:acme:error:(?:unauthorized|connection|dns|caa)The ACME certificate authority could not prove control of at least one requested name.