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The WHP panel sends Strict-Transport-Security max-age=31536000 includeSubDomains on every response (correct for prod). When a server is rebuilt, the regenerated self-signed cert no longer matches what the admin's browser cached as HSTS-valid, and there is no clickable 'proceed unsafely' escape — the admin is locked out of their own panel by hostname. Add a Caution Aside under Network & SSL describing the symptom, the two-browser HSTS confirmation pattern, and the three recovery paths (IP-direct + LE issuance, browser HSTS clear, real cert preserved across rebuilds). Frames LE issuance as a first-day operation, not an incident response. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>