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Docker bypassed my firewall: the database port was open to the internet
My host firewall blocked port 5432. It was reachable from the internet anyway, because Docker writes its own iptables rules that your INPUT and ufw rules never see. Why it happens, and how to actually close it.
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Cloudflare under the hood: how it works and how attackers try to get around it
What actually happens when a request hits a Cloudflare-protected site, how Turnstile distinguishes bots from humans, and the techniques attackers use to find the origin server behind the proxy.