There are few things in the deployment pipeline more anxiety-inducing than the red "Invalid Configuration" error in the Vercel dashboard. Your Next.js application builds perfectly, the preview URLs work, but your production custom domain is stuck. You might see an endless "Generating SSL" spinner, a generic 404 error on your apex domain (the non-www version), or a "Conflicting Records" warning. This is not a waiting game. If the configuration has been stuck for more than 15 minutes, it is likely a misconfiguration, not a propagation delay. This guide covers the root cause of these DNS failures and provides the specific technical steps to resolve them. The Root Cause: How Vercel Edge Network Validation Works To understand why your domain is failing, you must understand the validation handshake. When you add a domain to Vercel, two distinct processes occur: Ownership Verification: Vercel checks the DNS records to ensure you control the domain. SSL Certifi...
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