Run ss -tulpn.
ss -tulpn
Mission 284
Incident unknown listener
Map a listener to process and firewall evidence.
Troubleshootingsslsofufw
Lesson 284 of 360
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Troubleshooting · 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
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Lesson support
What to notice while you play.
Map a listener to process and firewall evidence.
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.
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.