Run ss -tulpn.
ss -tulpn
Mission 246
Firewall listener reconcile
Match exposed ports to firewall policy.
Security administrationssufwgrep
Lesson 246 of 360
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Security administration · 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 ufw status verbose.
ufw status verbose
Run grep 443 data/ports.txt.
grep 443 data/ports.txt
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Lesson support
What to notice while you play.
Match exposed ports to firewall policy.
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.
grep [-i] <text> <file>
Find literal text inside a file.
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.