How to Move Azure Front Door to Another Subscription Without Downtime

This article provides a detailed technical guide on migrating Azure Front Door instances across resource groups or subscriptions with zero downtime. It covers a high-level approach involving new origin setup, traffic shifting, and backend validation before the move. Key steps include validating move support, handling dependencies like WAF policies and custom domains, and addressing critical issues with customer-managed certificates in Azure Key Vault. The guide emphasizes that the move operation is non-disruptive but requires careful planning to avoid TLS failures. It offers step-by-step instructions using Azure Portal, CLI, or PowerShell, making it essential for IT professionals managing cloud infrastructure.