How to fix Unable to connect to the server: dial tcp: i/o timeout in Kubernetes

kubectl config view  # See current endpoint
ping <API-server-IP>
curl -k https://<API-server-IP>:6443  # Test HTTPS

kubectl config current-context
kubectl config get-contexts
kubectl config view

kubectl config use-context <correct-context>

# AWS EKS:
aws eks describe-cluster --name <cluster-name>

# GCP GKE:
gcloud container clusters describe <cluster-name>

# Azure AKS:
az aks show --name <cluster-name> --resource-group <group>

# GCP:
gcloud container clusters get-credentials <cluster-name> --zone <zone>

# AWS:
aws eks update-kubeconfig --name <cluster-name> --region <region>

# Azure:
az aks get-credentials --name <cluster-name> --resource-group <group>

# From your machine:
curl -v -k https://<API-server-IP>:6443

# Check AWS security group:
aws ec2 describe-security-groups --group-ids <sg-id>

# Check Azure NSG:
az network nsg rule list --resource-group <group> --nsg-name <nsg>

# Verify VPN is connected:
ip route show  # Check default route
ifconfig  # Look for VPN interface (usually tun0)

# Disconnect/reconnect VPN:
# (specific to your VPN client)

# Check for NO_PROXY conflicts:
echo $NO_PROXY
# Ensure cluster endpoint is not in NO_PROXY list

kubectl --request-timeout=60s get nodes

current-context: my-cluster
contexts:
- context:
    cluster: my-cluster
    user: admin
    cluster: my-cluster
  name: my-cluster
clusters:
- cluster:
    server: https://api.example.com:6443
  name: my-cluster

# Docker Desktop:
# Right-click Docker icon → Restart

# Minikube:
minikube stop
minikube start

# Then verify:
kubectl config use-context docker-for-desktop  # or minikube
kubectl get nodes

# SSH to control plane node:
ssh <control-plane-ip>

# Check API server:
sudo systemctl status kube-apiserver
sudo docker ps | grep kube-apiserver  # If containerized

# Check logs:
sudo journalctl -u kube-apiserver -n 50
sudo docker logs <api-server-container>  # If containerized

sudo systemctl restart kube-apiserver