Traefik not serving custom SSL certificate

Traefik Traefik v2
6

How Traefik TLS works. Traefik will first look for a matching cert (by hostname encoded in the cert, works with wildcards) in your list of defined certs:

tls:
  certificates:
    - certFile: /path/to/domain.cert
      keyFile: /path/to/domain.key
    - certFile: /path/to/second-domain.cert
      keyFile: /path/to/second-domain.key

If no match is found, then Traefik will use the single cert in the default store:

tls:
  stores:
    default:
      defaultCertificate:
        certFile: path/to/cert.crt
        keyFile: path/to/cert.key

If nothing is defined, it will create a custom Traefik cert, which the browser will warn about.

Make sure your cert files have the correct content:

certFile:
        -----BEGIN CERTIFICATE-----
        ...
        -----END CERTIFICATE-----
        -----BEGIN CERTIFICATE-----
        ...
        -----END CERTIFICATE-----
        -----BEGIN CERTIFICATE-----
        ...
        -----END CERTIFICATE-----
keyFile:
        -----BEGIN PRIVATE KEY-----
        ...
        -----END PRIVATE KEY-----