Fix: Traefik Let's Encrypt Certificate Renewal Failure

Traefik handles Let's Encrypt certificates automatically via ACME. Renewal fails when port 80 is blocked, DNS doesn't resolve to the server, or the acme.json file has permission issues.

Check Traefik ACME logs

docker logs traefik 2>&1 | grep -i "acme|cert|renew|error" | tail -30

Fix acme.json permissions

chmod 600 /path/to/acme.json
docker restart traefik

Traefik static config — verify ACME settings

certificatesResolvers:
  letsencrypt:
    acme:
      email: you@yourdomain.com
      storage: /acme.json        # Must be 600 permissions
      httpChallenge:
        entryPoint: web          # Port 80 must be accessible

Check your Traefik-managed domains for cert expiry in the SSL Checker.

Open Tool →

Fix: Traefik Let's Encrypt Certificate Renewal Failure

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