August Season: Cutting the Wire
Three boxes, three severed paths — DNS, firewall rules, and a route that was never supposed to disappear. Someone made sure nothing connected the way it should before they left. Trace each break, repair it properly, and recover what's waiting on the other side. All on sandboxes you fully control. Defensive practice only.
Archived season — playable for practice, no leaderboard points. Official write-ups are open.
DNS: The Parting Shot
forensics · dns · networking
Firewall: The Rule They Slipped In
forensics · firewall · nftables
Reach the Evidence Server
forensics · networking · dns
DNS: The Parting Shot
150 pts · decays to 60 · +25 first bloodThe outgoing sysadmin broke internal name resolution on their way out — the resolver only points at a public nameserver now, and the hosts file has lost the one static record everything else depends on. Restore resolution properly, then go see what they left behind for the next person to find. You have full root on this isolated, offline box.
The live sandbox for this challenge isn't available yet — brief and hints are open.
Hints
/etc/resolv.conf lists the nameservers the resolver queries — one is missing.
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Archived — solves are for practice, not the leaderboard.
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