certificate signed by unknown authority

[kotarusv]

stern -n kube-system etcd

failed to set up watch: failed to set up watch: Get https://api_host_lb_vip(fqdn):443/api/v1/namespaces/kube-system/pods?watch=true: x509: certificate signed by unknown authority

I don't think any issue with cert. API servers configured with prod grade certs. all tools ( api, kubectl, webuI) all works fine

Exampel:

curl https://api_host_lb_vip:443/healthz ok

Is it a bug or something else?

Srinivas Kotaru