This post documents a real debugging session that started with a simple symptom — example.com wouldn't load — and ended up uncovering several separate, unrelated problems layered on top of each other. It's written to walk through the actual diagnostic process, not just the final fix, since the process is usually the more useful part to learn from.
Starting point: an Ingress setup (from a previous post) was working, then stopped working after some changes were made mid-session, including installing a different CNI (Calico) on top of the cluster's existing one. This is the story of tracking that down.
The Symptom
curl: (7) Failed to connect to example.com port 80 after 21007 ms: Could not connect to server
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