Troubleshoot: peered VMs cannot talk to each other

حل مشكلة: VMs في VNets متوصلة بـ Peering مش بتكلم بعض

Ticket #4711 (priority: high) — "Since the change window last night, the web tier vm-web (Windows, vnet-hub, 10.1.1.4) cannot call the API on vm-app (Ubuntu, vnet-spoke, 10.2.1.4, port 80). The monitoring script on vm-app that pings vm-web also reports timeouts. The peering shows Connected, so the network team says it is not their problem." Find every layer that is blocking the traffic, fix each one with least privilege, and prove the symptom is gone from inside the guest OS.

The 4 tasks you will do

• Task 1 — Diagnose: reproduce from the guest and find the Azure ruleالمهمة 1 — التشخيص: كرّر المشكلة من جوه الـ VM ولاقي القاعدة في Azure
• Task 2 — Fix the NSG with least privilegeالمهمة 2 — صلّح الـ NSG بأقل صلاحيات
• Task 3 — Fix the Linux guest firewall and prove HTTP worksالمهمة 3 — صلّح الـ Firewall جوه Linux واثبت إن HTTP شغال
• Task 4 — Make the monitoring ping workالمهمة 4 — خلّي الـ ping بتاع المراقبة يشتغل