🕓 On October 29, 2025, Microsoft confirmed an Azure Front Door (AFD) incident triggered by a configuration change that caused latencies, timeouts, and errors across major Azure services.
🔄 Microsoft rolled back to a “last known good” configuration, but the recovery required rebalancing nodes — meaning intermittent failures continued for hours.
💬 Microsoft advised customers to consider failover strategies (like Azure Traffic Manager) to redirect traffic from AFD to origin servers while the platform recovers.
Why a BCP (Business Continuity Plan) Matters
🧩 Cloud resilience ≠ zero downtime — even Microsoft’s global edge network can fail.
🕹️ Control your own failover — don’t wait for Microsoft’s timeline.
💰 Reduce business impact — downtime means lost transactions and user trust.
🧪 Test, don’t trust — a documented BCP lets you redirect traffic confidently.
✅ The goal: keep your services online even when Azure Front Door goes down.
Simple BCP Idea: Use an NGINX Server with Built-in WAF as an Alternate Ingress
When AFD is unavailable, a small NGINX server (VM) can act as your “emergency door”, forwarding traffic directly to your origins. It’s independent, lightweight, and ready to activate at a moment's notice.
Key Benefits:
🧱 Built-in WAF for security
⚙️ Lightweight and low-cost
🔁 Quick DNS redirection for failover
🔒 Keeps control within your environment
High-Level Steps (No Deep Config Needed)
- Power On the standby NGINX VM (or pair).
If Azure Portal is down — use Azure CLI / PowerShell to connect. - Deploy a simple NGINX proxy config to forward requests to your app origins.
(Optionally include ModSecurity WAF.) - Validate connections — check response, headers, and logs.
- Create an alternate DNS record (
bcp.yourdomain) pointing to the NGINX IP.
Use low TTL (≈30 min) for quick propagation. - Failover: Update main production DNS to NGINX route when AFD fails.
- Monitor live traffic logs:
tail -f /var/log/nginx/access.logWatch for incoming requests and confirm healthy responses. - Revert DNS when Front Door stabilizes and verify normal routing.
Pro Tips
📉 Keep TTLs short on DNS A-records.
🧠 Document every failover step in your runbook.
🧍♂️ Regularly rehearse failover with your team.
🧰 Use Azure Traffic Manager if you want auto-failback behavior.
Alcaeus Services Can Help
Need a ready-to-activate BCP setup?
We’ll design a low-cost NGINX failover system with:
- A tested WAF configuration
- DNS and automation scripts
- Monitoring and log dashboards
- A one-page runbook for emergencies
💬 Contact Alcaeus Services — we’ll make sure your traffic never stops, even when Azure Front Door does.
