Can't access to Kibana : "[ConnectionError]: self signed certificate" with Helm

[Nastaszja]

I used Helm in order to install Open Distro for ElasticSearch.

My goal is to have a secure configuration with encryption of data.

I followed this tutorial : https://aws.amazon.com/fr/blogs/opensource/add-ssl-certificates-open-distro-for-elasticsearch/
where I created a local, self-signed Certificate Authority using OpenSSL and all the other certificates.

I made all the necessary secrets :
elasticsearch-account
elasticsearch-admin-certs
elasticsearch-rest-certs
elasticsearch-transport-certs
kibana-certs

I filled the config part for both Kibana and Elasticsearch in values.yaml

My Kibana Config part is as follow:

  config:
    ## Default Kibana configuration from kibana-docker.
    server.name: kibana
    server.host: "0"

    elasticsearch.hosts: "https://es-main-opendistro-es-client-service:9200"
    elasticsearch.requestTimeout: 360000

    logging.verbose: true

    ## Kibana TLS Config
    server.ssl.enabled: true
    server.ssl.key: /usr/share/kibana/certs/kibana-key.pem
    server.ssl.certificate: /usr/share/kibana/certs/kibana-crt.pem

    opendistro_security.cookie.secure: true
    opendistro_security.cookie.password: ${COOKIE_PASS}

    elasticsearch.username: ${ELASTICSEARCH_USERNAME}
    elasticsearch.password: ${ELASTICSEARCH_PASSWORD}

    opendistro_security.allow_client_certificates: true

    elasticsearch.ssl.certificate: /usr/share/kibana/certs/elk-rest-crt.pem
    elasticsearch.ssl.key: /usr/share/kibana/certs/elk-rest-key.pem
    elasticsearch.ssl.certificateAuthorities: ["/usr/share/kibana/certs/elk-rest-root-ca.pem"]

    opendistro_security.multitenancy.enabled: true
    opendistro_security.multitenancy.tenants.enable_private: false
    opendistro_security.multitenancy.tenants.enable_global: false
    opendistro_security.readonly_mode.roles: ["kibana_read_only"]

    elasticsearch.requestHeadersWhitelist: ["securitytenant","Authorization"]

My ElasticSearch config is as follows:

  config:
    opendistro_security.audit.ignore_users: ["kibanaserver"]
    opendistro_security.allow_unsafe_democertificates: false
    opendistro_security.allow_default_init_securityindex: true #
    opendistro_security.audit.type: internal_elasticsearch
    opendistro_security.roles_mapping_resolution: BOTH
    opendistro_security.restapi.roles_enabled: ["all_access", "security_rest_api_access"]

    opendistro_security.nodes_dn:
      - "CN=SS,OU=OPS,O=SS,L=Paris,ST=Paris,C=FR"

    opendistro_security.authcz.admin_dn:
      - "CN=SSA,OU=ADMIN,O=SS,L=Paris,ST=Paris,C=FR"
    opendistro_security.audit.config.disabled_rest_categories: NONE
    opendistro_security.audit.config.disabled_transport_categories: NONE

    node:
      max_local_storage_nodes: 1
      attr.box_type: hot


    processors: ${PROCESSORS:1}
    thread_pool.write.queue_size: 800

    http:
      compression: true

    # # TLS Configuration Transport Layer
    opendistro_security.ssl.transport.pemcert_filepath: elk-transport-crt.pem
    opendistro_security.ssl.transport.pemkey_filepath: elk-transport-key.pem
    opendistro_security.ssl.transport.pemtrustedcas_filepath: elk-transport-root-ca.pem
    opendistro_security.ssl.transport.enforce_hostname_verification: false #

    # # TLS Configuration REST Layer
    opendistro_security.ssl.http.enabled: true
    opendistro_security.ssl.http.pemcert_filepath: elk-rest-crt.pem
    opendistro_security.ssl.http.pemkey_filepath: elk-rest-key.pem
    opendistro_security.ssl.http.pemtrustedcas_filepath: elk-rest-root-ca.pem

When I am looking at my Kibana's logs, I constantly have :

{"type":"log","@timestamp":"2021-09-02T21:38:59Z","tags":["error","elasticsearch","data"],"pid":1,"message":"[ConnectionError]: self signed certificate"}
{"type":"log","@timestamp":"2021-09-02T21:39:02Z","tags":["error","elasticsearch","data"],"pid":1,"message":"[ConnectionError]: self signed certificate"}
{"type":"log","@timestamp":"2021-09-02T21:39:04Z","tags":["debug","metrics"],"pid":1,"message":"Refreshing metrics"}
{"type":"log","@timestamp":"2021-09-02T21:39:04Z","tags":["error","elasticsearch","data"],"pid":1,"message":"[ConnectionError]: self signed certificate"}

The logs of the master node, the client node and the data node don't show any errors.

Sorry if something is not clear, I am not familiar with SSL/TLS certificates.
Do you know how can I resolve my issue?