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The Migration Flip That Took Down a Live Customer (and the Blast Radius I Could Measure in 12 Seconds)
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The runbook said the domain was in account A. It was in account B. Verify ownership before touching live DNS.
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Cloudflare Error 1014: The Cert Issued. The Page Didn't Load.
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An Off-Origin Caddy Relay for Bare-Domain SSL (Because Cloudflare Pro Won't Proxy Your Apex)
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The IPv6 fix bit back: how localhost resolving to ::1 quietly broke a three-hop proxy chain
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My whole 1,200-domain provider split died instantly: keep a second DoH provider on hand