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multi-hop-tcp-debugging

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Atualizado4 de julho de 2026 às 10:25

Diagnose TCP services that span multiple hops — rootlessport → container → iptables DNAT → QEMU user networking → guest VM, or any chained proxy / NAT / userspace forwarder. Triggers when a 'TCP service not reachable' symptom has multiple plausible layer-3/4/7 explanations, when `nc -zv` says succeeded but the application still errors, when packet counters on iptables / NAT rules stay at 0, or when the user reports an RDP/VNC/SSH/DB connection failing despite some TCP handshake seemingly working. Covers hop-by-hop verification, what `nc -zv succeeded` actually proves, packet-counter-driven root-causing, and how to spot a host-side listener (rootlessport, socat, haproxy) that has nothing behind it.

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