Fix Azure AKS Network Policy Errors

Q: How do I debug network policy issues in Azure?

Use `az monitor activity-log list` to audit operations. For resource issues, use `az resource show`. For networking, use Network Watcher diagnostics. For role issues, check `az role assignment list`. Enable diagnostic settings for detailed logging. Use `az rest` to call Azure REST APIs directly for debugging.

Q: What are the best practices for network policy in Azure?

Use infrastructure-as-code (ARM, Terraform , Bicep) for all configurations. Tag resources for cost tracking and management. Use Azure Policy for governance. Enable diagnostic logs and monitoring. Follow Least Privilege for RBAC. Test in a non-production environment first. Review Azure Advisor recommendations regularly.

DodaTech Updated 2026-06-26 2 min read

When working with Azure AKS, you may encounter a configuration error that prevents your deployment from working. This guide explains the most common mistake with network policy and shows the exact fix.

A Common Mistake

Not enabling Network Policy on an AKS cluster, allowing all pods to communicate without restriction.

The incorrect command:

az aks create --name my-aks --resource-group my-rg --node-count 3 --network-plugin azure --network-policy ""

Error output:

Cluster created without network policy.
All pods can communicate with all other pods. A compromised frontend pod can directly access the database pod. There is no network segmentation between application tiers.

The Correct Approach

The right way to configure network policy in Azure AKS:

az aks create --name my-aks --resource-group my-rg --node-count 3 --network-plugin azure --network-policy calico
# Or: --network-policy azure

Successful result:

Cluster created with Calico network policy.
kubectl apply -f - <<EOF
apiVersion: networking.k8s.io/v1
kind: NetworkPolicy
metadata:
  name: deny-all
  namespace: default
spec:
  podSelector: {}
  policyTypes:
  - Ingress
  - Egress
EOF
networkpolicy.networking.k8s.io/deny-all created

How to Prevent This

Enable Network Policy on all production clusters. Options: Azure Network Policy (native) or Calico (more features). Use default-deny policy then allow required traffic. Calico supports: global network policies, egress policies, DNS-based policies. Monitor policy hits with flow logs.

FAQ

Why does my network policy configuration fail in Azure AKS?

Configuration failures in Azure often stem from missing role assignments, incorrect resource IDs, region availability issues, or ARM template parameter errors. Always use az --help to verify command syntax and parameter names. Check Azure Activity Log for detailed error traces.

How do I debug network policy issues in Azure?

Use az monitor activity-log list to audit operations. For resource issues, use az resource show. For networking, use Network Watcher diagnostics. For role issues, check az role assignment list. Enable diagnostic settings for detailed logging. Use az rest to call Azure REST APIs directly for debugging.

What are the best practices for network policy in Azure?

Use infrastructure-as-code (ARM, Terraform, Bicep) for all configurations. Tag resources for cost tracking and management. Use Azure Policy for governance. Enable diagnostic logs and monitoring. Follow Least Privilege for RBAC. Test in a non-production environment first. Review Azure Advisor recommendations regularly.

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