No answer from traefik with specific cipher suite

I am trying to validate two ciphersuite on an old device.


Traefik handles the second one perfectly and answers the request but it does not for the first one.
This cipher suite is the isssue then : TLS_ECDHE_ECDSA_WITH_AES_128_CBC_SHA256

Wireshark :

The very simple configuration :

  debug = true
  insecure = true
  level = "DEBUG"

directory = "."

    address = ":8090"
    address = ":8091"

    entryPoints = ["websecure"]
    rule = "PathPrefix(`/`)"
    service = "my-service"
		options = "myTLSOptions"
		url = ""
      certFile = "ca.crt"
	  keyFile = "ca.key"
	  certFile = "ca.crt"
	  keyFile = "ca.key"

		minVersion = "VersionTLS12"
		cipherSuites = [

The certificate is a self signed certificate with the key type prime256v1.

There is no error in the log or in the access log.

Is there anything I am doing wrong ?

Maybe check the Traefik Github issues, there are some (closed) ones with TLS_ECDHE_ECDSA_WITH_AES_128_CBC_SHA256.

I did not find anything related to my issue.