I am trying to connect to my kubernetes cluster which was spunup using kubeadm on aws instances. now when i am trying to connect to the cluster via lens am getting Failed to get /version for clusterId=: Internal Server Error
I am using lens desktop app on windows.
My kubeconfig file

apiVersion: v1
clusters:
- cluster:
    certificate-authority-data: DATA+OMITTED
    server: https://<private ip address of the master>:6443
  name: kubernetes
contexts:
- context:
    cluster: kubernetes
    user: kubernetes-admin
  name: kubernetes-admin@kubernetes
current-context: kubernetes-admin@kubernetes
kind: Config
preferences: {}
users:
- name: kubernetes-admin
  user:
    client-certificate-data: DATA+OMITTED
    client-key-data: DATA+OMITTED

i think the issue is with private ip address as server.
kindly help me with this
error

E0607 15:01:56.696813 3604 proxy_server.go:147] Error while proxying request: dial tcp :6443: connectex: A connection attempt failed because the connected party did not properly respond after a period of time, or established connection failed because connected host has failed to respond.
Failed to get /version for clusterId=: Internal Server Error