- Lab
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Troubleshoot Workload Reachability in Azure
In this lab, you'll diagnose and remediate a workload reachability failure in Azure. You will trace the access path from DNS through the load balancer and backend health, use effective NSG rules and effective routes to isolate the failing security element, apply the minimum fix, and re-test the original path. When you're finished, you will have restored HTTP reachability to the application endpoint and recorded the failure point, change, and verification result for handoff.
Lab Info
Table of Contents
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Challenge
Access the lab environment and establish the failure context
- Sign in to the Azure portal and open Azure Cloud Shell.
- Capture the resource group name and list the deployed resources.
- Retrieve the load balancer public IP and confirm the failure condition.
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Challenge
Test the access path from DNS through the load balancer
- Resolve the load balancer DNS name and confirm it maps to the expected public IP.
- Inspect the frontend, backend pool, health probe, and load-balancing rule.
- Check whether the load balancer reports the VM as healthy.
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Challenge
Diagnose security rules and routing
- View the effective NSG rules on the VM's NIC to identify the blocking deny rule.
- Inspect the
DenyHTTPInboundrule on the network security group. - Review the effective routes to confirm the return path is not misrouted.
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Challenge
Apply the minimum fix and confirm restoration
- Delete the blocking NSG inbound rule.
- Re-test the endpoint to confirm the application responds.
- Confirm the load balancer reports healthy instances.
- Record the failure point, change applied, and verification result for handoff.
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