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Diagnosing Kubernetes DNS Resolution Failures: CoreDNS Upstream Forwarding Broken by resolv.conf Drift

If some pods in your AKS cluster resolve external DNS names fine and others fail — from the same Deployment, same image, same config — the variable is the node. This guide covers the exact test sequence to isolate CoreDNS upstream forwarding failures, identify /etc/resolv.conf drift on worker nodes, and fix it without reprovisioning.

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How to Diagnose Azure ExpressRoute Gateway Control-Plane Failure

If your ExpressRoute Gateway shows BGP Connected but cross-premises traffic is down and effective routes on spoke VNet NICs are empty, the gateway has a control-plane failure. This guide covers the diagnostic commands to confirm it, a regional failover procedure, and the zone-redundant HA architecture to prevent recurrence.

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