Firewall (nftables) · medium · solved in-browser (no VM needed) · 3 tiered hints
Write /etc/nftables.conf where tcp dport 8080 is explicitly rejected with a TCP reset (reject with tcp reset), base table inet filter / input / policy drop. (Authored config, graded structurally — the engine isn't run here.)
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Open the challenge and an in-page editor appears — write your answer and tmpfs.tech grades it server-side against the same checks a real box would run. No VM, no install, no signup needed to try.
Author and reason about nftables rulesets — filtering, NAT and policy.
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