Run ss -tulpn.
ss -tulpn
Mission 299
Capstone unknown listener
Reconcile listeners, process owners, firewall, and service state.
Capstone labssslsofufwsystemctl
Lesson 299 of 360
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Capstone labs · 8 minutes
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learner@clairos:/home/learner $
Unix ops lab: type a command, press Enter
Instructions
8 minutes
Click any instruction for the command details, the why, and the common mistake to avoid.
Run lsof -i.
lsof -i
Run ufw status verbose.
ufw status verbose
Run systemctl list-units.
systemctl list-units
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Lesson support
What to notice while you play.
Reconcile listeners, process owners, firewall, and service state.
Run the commands in order and compare the outputs.
Junior operators build confidence by gathering evidence before changing systems.
- Skipping the inspection step.
- Assuming one command tells the whole story.
Reference
Commands in this lesson.
lsof
Show simulated files and sockets opened by services.
systemctl status <service>
Inspect simulated service status.
ss|ip
Inspect simulated sockets and addresses.
ssh|scp|ssh-keygen
Practice SSH inspection and dry-run transfer shapes without network access.
ufw status
Inspect simulated firewall rules.